diff --git a/.travis.yml b/.travis.yml
index 245c4eb..f1f7bf1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,8 @@ jobs:
       dist: trusty
     - php: 5.4
       dist: trusty
+    - php: 5.3.29
+      dist: precise
 
 install:
   - if [[ ${TRAVIS_PHP_VERSION:0:3} < "7.1" ]]; then rm composer.lock; fi
diff --git a/composer.json b/composer.json
index 7c9b4ad..5e1d195 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
 	"require-dev": {
 		"mikey179/vfsstream": "^1.6",
 		"mockery/mockery": "1.* || 0.*",
-		"mustangostang/spyc": "^0.6",
+		"mustangostang/spyc": "dev-master#eba310c",
 		"phpunit/phpunit": "7.* || 4.*"
 	},
 	"suggest": {
diff --git a/composer.lock b/composer.lock
index 4fb8d1d..cad2a38 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "ac5e07039672da7f040f0ff8506869f6",
+    "content-hash": "857529a9f504739efe6a1d43c40bdb5d",
     "packages": [],
     "packages-dev": [
         {
@@ -225,7 +225,7 @@
         },
         {
             "name": "mustangostang/spyc",
-            "version": "0.6.3",
+            "version": "dev-master",
             "source": {
                 "type": "git",
                 "url": "git@github.com:mustangostang/spyc.git",
@@ -1540,7 +1540,7 @@
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.13.0",
+            "version": "v1.13.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
@@ -1687,7 +1687,9 @@
     ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {
+        "mustangostang/spyc": 20
+    },
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
diff --git a/readme.md b/readme.md
index 8bf1423..8187c60 100644
--- a/readme.md
+++ b/readme.md
@@ -221,11 +221,13 @@ $posts = $repo->query()
 
 ## Config options
 
- - `formatter`. See [Formats](https://github.com/jamesmoss/flywheel#formats) section of this readme. Defaults to an
+ - `formatter`. See [Formats](#formats) section of this readme. Defaults to an
    instance of `JamesMoss\Flywheel\Formatter\JSON`.
  - `query_class`. The name of the class that gets returned from `Repository::query()`. By default, Flywheel detects
     if you have APC or APCu installed and uses `CachedQuery` class if applicable, otherwise it just uses `Query`.
  - `document_class`. The name of the class to use when hydrating documenst from the filesystem. Must implement `JamesMoss\Flywheel\DocumentInterface`. Defaults to `JamesMoss\Flywheel\Document`.
+ - `indexes`. See [Indexes](#indexes) section of this readme. Defaults to an
+   instance of `JamesMoss\Flywheel\Formatter\JSON`.
 
 
 ## Formats
@@ -252,12 +254,35 @@ The following formatter classes are available.
 **Important** If you use the `YAML` or `Markdown` formatters when using the `--no-dev` flag in Composer you'll need
 to manually add `mustangostang\spyc` to your `composer.json`. Flywheel tries to keep it's dependencies to a minimum.
 
-If you write your own formatter it must implement `JamesMoss\Flywheel\Formatter\Format`.
+If you write your own formatter it must implement `JamesMoss\Flywheel\Formatter\FormatInterface`.
+
+## Indexes
+
+To speed up the queries on some specific fields you can add indexes on these fields.
+There are different types of index, each specialized on certain queries:
+
+- `HashIndex` - supports only `==` and `!=` operators.
+
+If a query cannot be executed only on indexes it will fallback to the default behaviour, which is opening all the files of the repository.
+
+**Important** Indexes maintain their own copy of the data so you won't be able to manually edit the files while keeping the consistency of the database anymore.
+
+```php
+use JamesMoss\Flywheel\Index\HashIndex;
+
+$config = new Config('/path/to/writable/directory', array(
+    'indexes' => {
+        'fieldname' => HashIndex::class
+    },
+))
+```
+
+If you write your own index it must implement `JamesMoss\Flywheel\Index\IndexInterface`.
 
 ## Todo
 
 - More caching around `Repository::findAll`.
-- Indexing.
+- More Indexes.
 - HHVM support.
 - Abstract the filesystem, something like Gaufrette or Symfony's Filesystem component?
 - Events system.
diff --git a/src/JamesMoss/Flywheel/Config.php b/src/JamesMoss/Flywheel/Config.php
index 333686d..2f01f21 100644
--- a/src/JamesMoss/Flywheel/Config.php
+++ b/src/JamesMoss/Flywheel/Config.php
@@ -48,12 +48,13 @@ public function getPath()
      * Gets a specific option from the config
      *
      * @param string $name The name of the option to return.
+     * @param mixed $default The default value to use.
      *
      * @return mixed The value of the option if it exists or null if it doesnt.
      */
-    public function getOption($name)
+    public function getOption($name, $default = null)
     {
-        return isset($this->options[$name]) ? $this->options[$name] : null;
+        return isset($this->options[$name]) ? $this->options[$name] : $default;
     }
 
     public function hasAPC()
diff --git a/src/JamesMoss/Flywheel/Formatter/JSON.php b/src/JamesMoss/Flywheel/Formatter/JSON.php
index d848aaa..89d9630 100644
--- a/src/JamesMoss/Flywheel/Formatter/JSON.php
+++ b/src/JamesMoss/Flywheel/Formatter/JSON.php
@@ -2,8 +2,18 @@
 
 namespace JamesMoss\Flywheel\Formatter;
 
+defined('JSON_OBJECT_AS_ARRAY') or define('JSON_OBJECT_AS_ARRAY', 1);
+defined('JSON_PRETTY_PRINT') or define('JSON_PRETTY_PRINT', 128);
+
 class JSON implements FormatInterface
 {
+    protected $jsonOptions;
+
+    public function __construct($jsonOptions = 0)
+    {
+        $this->jsonOptions = $jsonOptions;
+    }
+
     public function getFileExtension()
     {
         return 'json';
@@ -11,13 +21,11 @@ public function getFileExtension()
 
     public function encode(array $data)
     {
-        $options = defined('JSON_PRETTY_PRINT') ? JSON_PRETTY_PRINT : null;
-
-        return json_encode($data, $options);
+        return json_encode($data, $this->jsonOptions);
     }
 
     public function decode($data)
     {
-        return json_decode($data);
+        return json_decode($data, $this->jsonOptions&JSON_OBJECT_AS_ARRAY);
     }
 }
\ No newline at end of file
diff --git a/src/JamesMoss/Flywheel/Index/HashIndex.php b/src/JamesMoss/Flywheel/Index/HashIndex.php
new file mode 100644
index 0000000..50095ec
--- /dev/null
+++ b/src/JamesMoss/Flywheel/Index/HashIndex.php
@@ -0,0 +1,104 @@
+<?php
+
+namespace JamesMoss\Flywheel\Index;
+
+use JamesMoss\Flywheel\Formatter\JSON;
+use JamesMoss\Flywheel\Index\StoredIndex;
+use stdClass;
+
+class HashIndex extends StoredIndex
+{
+    protected static $operators = array(
+        '==', '!='
+    );
+
+    /**
+     * @inheritdoc
+     */
+    public function __construct($field, $repository) {
+        $this->construct($field, $repository, new JSON(JSON_OBJECT_AS_ARRAY));
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function isOperatorCompatible($operator)
+    {
+        return in_array($operator, self::$operators);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function initData()
+    {
+        $this->data = array();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getEntries($value, $operator)
+    {
+        if (!isset($this->data[$value])) {
+            return array();
+        }
+        switch ($operator) {
+            case '==': return array_keys($this->data[$value]);
+            case '!=': return $this->idsExcept($value);
+            default: throw new \InvalidArgumentException('Incompatible operator `'.$operator.'`.');
+        }
+    }
+
+    /**
+     * Adds an entry in the index
+     *
+     * @param string $id
+     * @param string $value
+     */
+    protected function addEntry($id, $value)
+    {
+        if (!isset($this->data[$value])) {
+            $this->data[$value] = array();
+        }
+        $this->data[$value][$id] = 1;
+    }
+
+    /**
+     * Removes an entry from the index
+     *
+     * @param string $id
+     * @param string $value
+     */
+    protected function removeEntry($id, $value)
+    {
+        if (!isset($this->data[$value])) {
+            return;
+        }
+        unset($this->data[$value][$id]);
+        if (count($this->data[$value]) === 0) {
+            unset($this->data[$value]);
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function updateEntry($id, $new, $old)
+    {
+        if ($new !== null) {
+            $this->addEntry($id, $new);
+        }
+        if ($old !== null) {
+            $this->removeEntry($id, $old);
+        }
+    }
+
+    protected function idsExcept($value) {
+        $data = $this->data;
+        unset($data[$value]);
+        return array_keys(array_reduce($data, function($prev, $val) {
+            return array_merge($prev, $val);
+        }, array()));
+    }
+}
diff --git a/src/JamesMoss/Flywheel/Index/IndexInterface.php b/src/JamesMoss/Flywheel/Index/IndexInterface.php
new file mode 100644
index 0000000..9097e33
--- /dev/null
+++ b/src/JamesMoss/Flywheel/Index/IndexInterface.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace JamesMoss\Flywheel\Index;
+
+interface IndexInterface
+{
+    /**
+     * Constructor
+     *
+     * @param string $field the field to index.
+     * @param Repository $repository the repository of this index.
+     */
+    public function __construct($field, $repository);
+
+    /**
+     * Checks if the given operator is compatible with this index.
+     *
+     * @param string $operator the operator to check.
+     *
+     * @return bool true if it is compatible.
+     */
+    public function isOperatorCompatible($operator);
+
+    /**
+     * Get documents from the index.
+     *
+     * @param mixed $value the value we are looking for.
+     * @param string $operator the operator used for comparision.
+     *
+     * @return array<int,string> a list of documents ids.
+     */
+    public function get($value, $operator);
+
+    /**
+     * Update a document in the index.
+     *
+     * @param string $id the id of this document.
+     * @param mixed $new the new value of this document for the indexed field.
+     * @param mixed $old the old value of this document for the indexed field.
+     *
+     * @return void
+     */
+    public function update($id, $new, $old);
+
+    /**
+     * Regenerate the index from the repository's documents.
+     *
+     * @return void;
+     */
+    public function regenerate();
+}
diff --git a/src/JamesMoss/Flywheel/Index/StoredIndex.php b/src/JamesMoss/Flywheel/Index/StoredIndex.php
new file mode 100644
index 0000000..5320c48
--- /dev/null
+++ b/src/JamesMoss/Flywheel/Index/StoredIndex.php
@@ -0,0 +1,153 @@
+<?php
+
+namespace JamesMoss\Flywheel\Index;
+
+use JamesMoss\Flywheel\Index\IndexInterface;
+use JamesMoss\Flywheel\Formatter\FormatInterface;
+use JamesMoss\Flywheel\Formatter\JSON;
+use JamesMoss\Flywheel\Repository;
+
+abstract class StoredIndex implements IndexInterface
+{
+    /** @var mixed $data                content of the index */
+    protected $data = null;
+
+    /** @var string $field              name of the indexed field */
+    protected $field;
+
+    /** @var FormatInterface $formatter used to store data */
+    protected $formatter;
+
+    /** @var Repository $repository     repository of the index */
+    protected $repository;
+
+    /** @var string $path               where the data is stored */
+    protected $path;
+
+    /**
+     * Protected constructor
+     *
+     * @param string $field the field to index.
+     * @param Repository $repository the repository of this index.
+     * @param FormatInterface $formatter the formatter used to store the data.
+     */
+    protected function construct($field, $repository, $formatter = null)
+    {
+        $this->field = $field;
+        $this->formatter = $formatter == null ? new JSON() : $formatter;
+        $this->repository = $repository;
+        $this->path = $repository->addDirectory('.indexes') . DIRECTORY_SEPARATOR . "$field." . $this->formatter->getFileExtension();
+    }
+
+    /**
+     * @inheritdoc
+     */
+    abstract public function __construct($field, $repository);
+
+    /**
+     * @inheritdoc
+     */
+    abstract public function isOperatorCompatible($operator);
+
+    /**
+     * @inheritdoc
+     */
+    public function get($value, $operator)
+    {
+        $this->needsData();
+        return $this->getEntries($value, $operator);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function update($id, $new, $old)
+    {
+        if ($new === $old) {
+            return;
+        }
+        $this->needsData();
+        $this->updateEntry($id, $new, $old);
+        $this->flush();
+    }
+
+    /**
+     * Lazyloading data initializer.
+     *
+     * @return void
+     */
+    protected function needsData()
+    {
+        if (isset($this->data)) {
+            return;
+        }
+        if (file_exists($this->path)) {
+            $fp       = fopen($this->path, 'r');
+            $contents = fread($fp, filesize($this->path));
+            fclose($fp);
+            $this->data = $this->formatter->decode($contents);
+        } else {
+            $this->regenerate();
+        }
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function regenerate()
+    {
+        $this->initData();
+        foreach ($this->repository->findAll() as $doc) {
+            $docVal = $doc->getNestedProperty($this->field, $found);
+            if (!$found) {
+                continue;
+            }
+            $this->updateEntry($doc->getId(), $docVal, null);
+        }
+        $this->flush();
+    }
+
+    /**
+     * Write back the data on the filesystem.
+     *
+     * @return bool succeded.
+     */
+    protected function flush()
+    {
+        $contents = $this->formatter->encode($this->data);
+        $fp = fopen($this->path, 'w');
+        if (!flock($fp, LOCK_EX)) {
+            return false;
+        }
+        $result = fwrite($fp, $contents);
+        flock($fp, LOCK_UN);
+        fclose($fp);
+
+        return $result !== false;
+    }
+
+    /**
+     * Init the data object
+     *
+     * @return void
+     */
+    abstract protected function initData();
+
+    /**
+     * Get entries from the index
+     *
+     * @param string $value
+     * @param string $operator
+     *
+     * @return array<int,string> array of ids
+     */
+    abstract protected function getEntries($value, $operator);
+
+    /**
+     * Removes an entry from the index
+     *
+     * @param string $id
+     * @param string $value
+     */
+    abstract protected function updateEntry($id, $new, $old);
+}
diff --git a/src/JamesMoss/Flywheel/Predicate.php b/src/JamesMoss/Flywheel/Predicate.php
index 7efe0ec..8d75d4c 100644
--- a/src/JamesMoss/Flywheel/Predicate.php
+++ b/src/JamesMoss/Flywheel/Predicate.php
@@ -14,7 +14,7 @@ class Predicate
     const LOGICAL_OR = 'or';
 
     protected $predicates = array();
-    protected $operators = array(
+    protected static $operators = array(
         '>', '>=', '<', '<=', '==', '===', '!=', '!==', 'IN',
     );
 
@@ -63,7 +63,7 @@ protected function addPredicate($type, $field, $operator = null, $value = null)
             throw new \InvalidArgumentException('Field name cannot be empty.');
         }
 
-        if (!in_array($operator, $this->operators)) {
+        if (!in_array($operator, self::$operators)) {
             throw new \InvalidArgumentException('Unknown operator `'.$operator.'`.');
         }
 
diff --git a/src/JamesMoss/Flywheel/QueryExecuter.php b/src/JamesMoss/Flywheel/QueryExecuter.php
index 9d9e296..d3628f5 100644
--- a/src/JamesMoss/Flywheel/QueryExecuter.php
+++ b/src/JamesMoss/Flywheel/QueryExecuter.php
@@ -14,6 +14,7 @@ class QueryExecuter
     protected $predicate;
     protected $limit;
     protected $orderBy;
+    protected $indexes;
 
     /**
      * Constructor
@@ -29,6 +30,7 @@ public function __construct(Repository $repo, Predicate $pred, array $limit, arr
         $this->predicate = $pred;
         $this->limit = $limit;
         $this->orderBy = $orderBy;
+        $this->indexes = $repo->getIndexes();
     }
 
     /**
@@ -38,10 +40,17 @@ public function __construct(Repository $repo, Predicate $pred, array $limit, arr
      */
     public function run()
     {
-        $documents = $this->repo->findAll();
-
+        /** @var array<int,Document> $documents */
+        $documents;
         if ($predicates = $this->predicate->getAll()) {
-            $documents = $this->filter($documents, $predicates);
+            if ($this->isFullIndex($predicates)) {
+                $documents = $this->findByIndex($predicates);
+            } else {
+                $documents = $this->repo->findAll();
+                $documents = $this->filter($documents, $predicates);
+            }
+        } else {
+            $documents = $this->repo->findAll();
         }
 
         if ($this->orderBy) {
@@ -114,6 +123,32 @@ public function matchDocument($doc, $field, $operator, $value)
         return false;
     }
 
+    /**
+     * Checks if the query can be executed with indexes only.
+     *
+     * @param array<int,array> $predicates the array of predicates.
+     *
+     * @return bool true if it can.
+     */
+    protected function isFullIndex($predicates)
+    {
+        foreach ($predicates as $p) {
+            list($type, $field, $operator) = $p;
+            if (!isset($this->indexes[$field]) || !$this->indexes[$field]->isOperatorCompatible($operator)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Filters an array of documents by the predicates.
+     *
+     * @param array<int,Document> $documents the array to filter.
+     * @param array<int,array> $predicates the array of predicates.
+     *
+     * @return array<int,Document> the filtered array of documents.
+     */
     protected function filter($documents, $predicates)
     {
         $result = array();
@@ -162,6 +197,50 @@ protected function filter($documents, $predicates)
         return $result;
     }
 
+    /**
+     * Find an array of documents from the predicates using the indexes.
+     *
+     * @param array<int,array> $predicates the array of predicates.
+     *
+     * @return array<int,Document> the filtered array of documents.
+     */
+    protected function findByIndex($predicates) {
+        $result = array();
+        $ids = array();
+
+        $andPredicates = array_filter($predicates, function($pred) {
+            return $pred[0] !== Predicate::LOGICAL_OR;
+        });
+
+        $orPredicates = array_filter($predicates, function($pred) {
+            return $pred[0] === Predicate::LOGICAL_OR;
+        });
+
+        foreach($andPredicates as $predicate) {
+            if (is_array($predicate[1])) {
+                $ids = $this->findByIndex($predicate[1]);
+            } else {
+                list($type, $field, $operator, $value) = $predicate;
+                $ids = $this->indexes[$field]->get($value, $operator);
+            }
+
+            $result = $ids;
+        }
+
+        foreach($orPredicates as $predicate) {
+            if (is_array($predicate[1])) {
+                $ids = $this->findByIndex($predicate[1]);
+            } else {
+                list($type, $field, $operator, $value) = $predicate;
+                $ids = $this->indexes['$field']->get($value, $operator);
+            }
+
+            $result = array_unique(array_merge($result, $ids), SORT_REGULAR);
+        }
+
+        return $this->repo->findByIds($result);
+    }
+
     /**
      * Sorts an array of documents by multiple fields if needed.
      *
diff --git a/src/JamesMoss/Flywheel/Repository.php b/src/JamesMoss/Flywheel/Repository.php
index c4463d4..244191b 100644
--- a/src/JamesMoss/Flywheel/Repository.php
+++ b/src/JamesMoss/Flywheel/Repository.php
@@ -2,6 +2,8 @@
 
 namespace JamesMoss\Flywheel;
 
+use JamesMoss\Flywheel\Index\IndexInterface;
+
 /**
  * Repository
  *
@@ -15,6 +17,8 @@ class Repository
     protected $formatter;
     protected $queryClass;
     protected $documentClass;
+    /** @var array<string,IndexInterface> $indexes */
+    protected $indexes;
 
     /**
      * Constructor
@@ -30,20 +34,47 @@ public function __construct($name, Config $config)
         $this->formatter     = $config->getOption('formatter');
         $this->queryClass    = $config->getOption('query_class');
         $this->documentClass = $config->getOption('document_class');
+        $this->indexes       = $config->getOption('indexes', array());
+        $self = $this;
+        array_walk($this->indexes, function(&$class, $field) use ($self) {
+            if (!is_subclass_of($class, '\JamesMoss\Flywheel\Index\IndexInterface')) {
+                throw new \RuntimeException(sprintf('`%s` does not implement IndexInterface.', $class));
+            }
+            $class = new $class($field, $self);
+        });
 
         // Ensure the repo name is valid
         $this->validateName($this->name);
+        $this->ensureDirectory($this->path);
+    }
 
-        // Ensure directory exists and we can write there
-        if (!is_dir($this->path)) {
-            if (!@mkdir($this->path, 0777, true)) {
-                throw new \RuntimeException(sprintf('`%s` doesn\'t exist and can\'t be created.', $this->path));
+    /**
+     * Ensure directory exists and we can write there
+     */
+    protected function ensureDirectory($path) {
+        if (!is_dir($path)) {
+            if (!@mkdir($path, 0777, true)) {
+                throw new \RuntimeException(sprintf('`%s` doesn\'t exist and can\'t be created.', $path));
             }
-        } else if (!is_writable($this->path)) {
-            throw new \RuntimeException(sprintf('`%s` is not writable.', $this->path));
+        } else if (!is_writable($path)) {
+            throw new \RuntimeException(sprintf('`%s` is not writable.', $path));
         }
     }
 
+    /**
+     * Adds a directory in the repository.
+     *
+     * @param string $name The name of the new directory.
+     *
+     * @return string The path of the directory.
+     */
+    public function addDirectory($name)
+    {
+        $path = $this->path . DIRECTORY_SEPARATOR . $name;
+        $this->ensureDirectory($path);
+        return $path;
+    }
+
     /**
      * Returns the name of this repository
      *
@@ -64,6 +95,16 @@ public function getPath()
         return $this->path;
     }
 
+    /**
+     * Returns the list of indexes of this repository.
+     *
+     * @return array<string,IndexInterface> The list of indexes.
+     */
+    public function getIndexes()
+    {
+        return $this->indexes;
+    }
+
     /**
      * A factory method that initialises and returns an instance of a Query object.
      *
@@ -79,7 +120,7 @@ public function query()
     /**
      * Returns all the documents within this repo.
      *
-     * @return array An array of Documents.
+     * @return array<int,Document> An array of Documents.
      */
     public function findAll()
     {
@@ -89,7 +130,10 @@ public function findAll()
 
         foreach ($files as $file) {
             $fp       = fopen($file, 'r');
-            $contents = fread($fp, filesize($file));
+            $contents = null;
+            if(($filesize = filesize($file)) > 0) {
+                $contents = fread($fp, $filesize);
+            }
             fclose($fp);
 
             $data = $this->formatter->decode($contents);
@@ -110,7 +154,7 @@ public function findAll()
      *
      * @param  string $id The ID of the document to find
      *
-     * @return Document|boolean  The document if it exists, false if not.
+     * @return Document|false The document if it exists, false if not.
      */
     public function findById($id)
     {
@@ -119,7 +163,10 @@ public function findById($id)
         }
 
         $fp       = fopen($path, 'r');
-        $contents = fread($fp, filesize($path));
+        $contents = null;
+        if(($filesize = filesize($path)) > 0) {
+            $contents = fread($fp, $filesize);
+        }
         fclose($fp);
 
         $data = $this->formatter->decode($contents);
@@ -136,12 +183,46 @@ public function findById($id)
         return $doc;
     }
 
+    /**
+     * Returns a list of documents based on their ID.
+     *
+     * @param array<int,string> $ids The IDs array of document to find.
+     *
+     * @return array<int,Document>|false An array of Documents.
+     */
+    public function findByIds($ids)
+    {
+        $ext       = $this->formatter->getFileExtension();
+        $documents = array();
+        foreach ($ids as $id) {
+            if(!file_exists($path = $this->getPathForDocument($id))) {
+                return false;
+            }
+            $fp       = fopen($path, 'r');
+            $contents = null;
+            if(($filesize = filesize($path)) > 0) {
+                $contents = fread($fp, $filesize);
+            }
+            fclose($fp);
+
+            $data = $this->formatter->decode($contents);
+
+            if (null !== $data) {
+                $doc = new $this->documentClass((array) $data);
+                $doc->setId($this->getIdFromPath($path, $ext));
+
+                $documents[] = $doc;
+            }
+        }
+        return $documents;
+    }
+
     /**
      * Store a Document in the repository.
      *
      * @param Document $document The document to store
      *
-     * @return bool True if stored, otherwise false
+     * @return string|false True if stored, otherwise false
      */
     public function store(DocumentInterface $document)
     {
@@ -155,6 +236,20 @@ public function store(DocumentInterface $document)
         if (!$this->validateId($id)) {
             throw new \Exception(sprintf('`%s` is not a valid document ID.', $id));
         }
+        $previous = $this->findById($id);
+        foreach ($this->indexes as $field => $index) {
+            $oldFound = false;
+            $newFound = false;
+            $oldVal = $previous ? $previous->getNestedProperty($field, $oldFound) : null;
+            $newVal = $document->getNestedProperty($field, $newFound);
+            if (!$oldFound && $newFound) {
+                $index->update($document->getId(), $newVal, null);
+            } elseif ($oldFound && !$newFound) {
+                $index->update($document->getId(), null, $oldVal);
+            } elseif ($oldFound && $newFound) {
+                $index->update($document->getId(), $newVal, $oldVal);
+            }
+        }
 
         $path = $this->getPathForDocument($id);
         $data = get_object_vars($document);
@@ -173,7 +268,7 @@ public function store(DocumentInterface $document)
      *
      * @param Document $document The document to store
      *
-     * @return bool True if stored, otherwise false
+     * @return string|false the id if stored, otherwise false
      */
     public function update(DocumentInterface $document)
     {
@@ -189,9 +284,14 @@ public function update(DocumentInterface $document)
 
         // If the ID has changed we need to delete the old document.
         if($document->getId() !== $document->getInitialId()) {
-            if(file_exists($oldPath)) {
-                unlink($oldPath);
+            $previous = $this->findById($document->getInitialId());
+            foreach ($this->indexes as $field => $index) {
+                $value = $previous->getNestedProperty($field, $found);
+                if ($found) {
+                    $index->update($previous->getId(), null, $value);
+                }
             }
+            unlink($oldPath);
         }
 
         return $this->store($document);
@@ -200,14 +300,24 @@ public function update(DocumentInterface $document)
     /**
      * Delete a document from the repository using its ID.
      *
-     * @param mixed $id The ID of the document (or the document itself) to delete
+     * @param mixed $doc The ID of the document (or the document itself) to delete
      *
      * @return boolean True if deleted, false if not.
      */
-    public function delete($id)
+    public function delete($doc)
     {
-        if ($id instanceof DocumentInterface) {
-            $id = $id->getId();
+        if ($doc instanceof DocumentInterface) {
+            $id = $doc->getId();
+        } else {
+            $id = $doc;
+            $doc = $this->findById($id);
+        }
+        foreach ($this->indexes as $field => $index) {
+            $found = false;
+            $value = $doc ? $doc->getNestedProperty($field, $found) : null;
+            if ($found) {
+                $index->update($id, null, $value);
+            }
         }
 
         $path = $this->getPathForDocument($id);
@@ -338,4 +448,11 @@ protected function getIdFromPath($path, $ext)
         return basename($path, '.' . $ext);
     }
 
+    public function regenerateIndexes()
+    {
+        foreach ($this->indexes as $index) {
+            $index->regenerate();
+        }
+    }
+
 }
diff --git a/test/JamesMoss/Flywheel/Formatter/JSONTest.php b/test/JamesMoss/Flywheel/Formatter/JSONTest.php
index 56a132b..2bca33e 100644
--- a/test/JamesMoss/Flywheel/Formatter/JSONTest.php
+++ b/test/JamesMoss/Flywheel/Formatter/JSONTest.php
@@ -14,16 +14,16 @@ public function testFileExtension()
 
     public function testEncoding()
     {
-        $formatter = new JSON;
+        $formatter = new JSON();
+        $formatterPretty = new JSON(JSON_PRETTY_PRINT);
         $data = array(
             'name'     => 'Joe',
             'age'      => 21,
             'employed' => true,
         );
 
-        $options = defined('JSON_PRETTY_PRINT') ? JSON_PRETTY_PRINT : null;
-
-        $this->assertSame(json_encode($data, $options), $formatter->encode($data));
+        $this->assertSame(json_encode($data), $formatter->encode($data));
+        $this->assertSame(json_encode($data, JSON_PRETTY_PRINT), $formatterPretty->encode($data));
     }
 
     public function testDecoding()
diff --git a/test/JamesMoss/Flywheel/Index/HashIndexTest.php b/test/JamesMoss/Flywheel/Index/HashIndexTest.php
new file mode 100644
index 0000000..a1f09ad
--- /dev/null
+++ b/test/JamesMoss/Flywheel/Index/HashIndexTest.php
@@ -0,0 +1,259 @@
+<?php
+
+namespace JamesMoss\Flywheel\Index;
+
+use JamesMoss\Flywheel\Config;
+use JamesMoss\Flywheel\Document;
+use JamesMoss\Flywheel\Formatter\JSON;
+use JamesMoss\Flywheel\Index\HashIndex;
+use JamesMoss\Flywheel\Repository;
+use JamesMoss\Flywheel\TestBase;
+
+class HashIndexTest extends TestBase
+{
+    const REPO_DIR  = '/tmp/flywheel';
+    const REPO_NAME = '_index_test';
+    const REPO_PATH = '/tmp/flywheel/_index_test/';
+
+    /** @var Repository $repo */
+    private $repo;
+
+    /** @var HashIndex $index */
+    private $index;
+
+    protected function setUp()
+    {
+        parent::setUp();
+        if (!is_dir(self::REPO_DIR)) {
+            mkdir(self::REPO_DIR);
+        }
+        $config = new Config(self::REPO_DIR, array(
+            'indexes' => array(
+                'col1' => "JamesMoss\Flywheel\Index\HashIndex",
+            )
+        ));
+        $this->repo = new Repository(self::REPO_NAME, $config);
+        $this->index = new HashIndex('col1', $this->repo);
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+        $this->recurseRmdir(self::REPO_PATH);
+    }
+
+    public function testAddEntry()
+    {
+        $id = 'testdoc123';
+        $this->index->update($id, '123', null);
+        $this->assertEquals(array($id), $this->index->get('123', '=='));
+    }
+
+    public function testRemoveEntry()
+    {
+        $id = 'testdoc123';
+        $this->index->update($id, '123', null);
+        $this->assertEquals(array($id), $this->index->get('123', '=='));
+        $this->index->update($id, null, '123');
+        $this->assertEquals(array(), $this->index->get('123', '=='));
+    }
+
+    public function testUpdateEntry()
+    {
+        $id = 'testdoc123';
+        $this->index->update($id, '123', null);
+        $this->assertEquals(array($id), $this->index->get('123', '=='));
+        $this->index->update($id, '456', '123');
+        $this->assertEquals(array(), $this->index->get('123', '=='));
+        $this->assertEquals(array($id), $this->index->get('456', '=='));
+    }
+
+    public function testGet()
+    {
+        $n = 4;
+        for ($i=1; $i <= $n; $i++) {
+            $id = "doc$i";
+            $this->index->update($id, "val$i", null);
+        }
+        $this->assertEquals(array('doc1'), $this->index->get('val1', '=='));
+        $this->assertEquals(array('doc1', 'doc2', 'doc4'), $this->index->get('val3', '!='));
+    }
+
+    public function testStoreDocument()
+    {
+        $doc = new Document(array(
+            'col1' => '123',
+        ));
+        $id = 'testdoc123';
+        $doc->setId($id);
+        $this->assertEquals($id, $this->repo->store($doc));
+        $this->assertEquals(array($id), $this->index->get('123', '=='));
+    }
+
+    public function testReStoreDocumentNochange()
+    {
+        $doc = new Document(array(
+            'col1' => '123',
+        ));
+        $id = 'testdoc123';
+        $doc->setId($id);
+        $this->assertEquals($id, $this->repo->store($doc));
+        $this->assertEquals($id, $this->repo->store($doc));
+        $this->assertEquals(array($id), $this->index->get('123', '=='));
+    }
+
+    public function testReStoreDocumentAdd()
+    {
+        $doc = new Document(array(
+            'col2' => '123',
+        ));
+        $id = 'testdoc123';
+        $doc->setId($id);
+        $this->assertEquals($id, $this->repo->store($doc));
+        $doc->col1 = '456';
+        $this->assertEquals($id, $this->repo->store($doc));
+        $this->assertEquals(array($id), $this->index->get('456', '=='));
+    }
+
+    public function testReStoreDocumentUpdate()
+    {
+        $doc = new Document(array(
+            'col1' => '123',
+        ));
+        $id = 'testdoc123';
+        $doc->setId($id);
+        $this->assertEquals($id, $this->repo->store($doc));
+        $doc->col1 = '456';
+        $this->assertEquals($id, $this->repo->store($doc));
+        $this->assertEquals(array(), $this->index->get('123', '=='));
+        $this->assertEquals(array($id), $this->index->get('456', '=='));
+    }
+
+    public function testReStoreDocumentRemove()
+    {
+        $doc = new Document(array(
+            'col1' => '123',
+        ));
+        $id = 'testdoc123';
+        $doc->setId($id);
+        $this->assertEquals($id, $this->repo->store($doc));
+        unset($doc->col1);
+        $this->assertEquals($id, $this->repo->store($doc));
+        $this->assertEquals(array(), $this->index->get('123', '=='));
+    }
+
+    public function testUpdateDocument()
+    {
+        $doc = new Document(array(
+            'col1' => '123',
+        ));
+        $id = 'testdoc123';
+        $doc->setId($id);
+        $this->assertEquals($id, $this->repo->store($doc));
+        $id = 'testdoc456';
+        $doc->setId($id);
+        $doc->col1 = '456';
+        $this->assertEquals($id, $this->repo->update($doc));
+        $this->assertEquals(array(), $this->index->get('123', '=='));
+        $this->assertEquals(array($id), $this->index->get('456', '=='));
+    }
+
+    public function testExistingData()
+    {
+        $repo = new Repository(self::REPO_NAME, new Config(
+            self::REPO_DIR
+        ));
+        $doc = new Document(array(
+            'col1' => '123',
+        ));
+        $id = 'testdoc123';
+        $doc->setId($id);
+        $this->assertEquals($id, $repo->store($doc));
+        $this->assertEquals(array($id), $this->index->get('123', '=='));
+    }
+
+    public function testMultidimentionalKey()
+    {
+        $id = 'testdoc456';
+        $doc = new Document(array(
+            'col2' => array('4', '5', '6'),
+        ));
+        $doc->setId($id);
+
+        $repo2 = new Repository(self::REPO_NAME, new Config(
+            self::REPO_DIR, array(
+                'indexes' => array(
+                    'col2.0' => "JamesMoss\Flywheel\Index\HashIndex",
+                )
+            )
+        ));
+
+        // test generating index from fs
+        $this->assertEquals($id, $this->repo->store($doc));
+        $index1 = new HashIndex('col2.0', $this->repo);
+        $this->assertEquals(array($id), $index1->get('4', '=='));
+        $this->assertTrue($this->repo->delete($doc));
+
+        // test generating index on store document
+        $this->assertEquals($id, $repo2->store($doc));
+        $indexes = $repo2->getIndexes();
+        $index2 = $indexes['col2.0'];
+        $this->assertEquals(array($id), $index2->get('4', '=='));
+        $id = 'doc456';
+        $doc->setId($id);
+        $this->assertEquals($id, $repo2->update($doc));
+        $this->assertEquals(array($id), $index2->get('4', '=='));
+        $this->assertTrue($repo2->delete($id));
+        $this->assertEquals(array(), $index2->get('4', '=='));
+    }
+
+    public function testInconsitentData()
+    {
+        $doc1 = new Document(array('col1' => '1'));
+        $doc1->setId('doc1');
+        $doc2 = new Document(array('col2' => '2'));
+        $doc2->setId('doc2');
+        $doc3 = new Document(array('col1' => ''));
+        $doc3->setId('doc3');
+        $doc4 = new Document(array('col2' => '4'));
+        $doc4->setId('doc4');
+        $doc5 = new Document(array('col1' => ''));
+        $doc5->setId('doc5');
+
+        $repo2 = new Repository(self::REPO_NAME, new Config(self::REPO_DIR, array()));
+        $query11 = $this->repo->query()->where('col1', '==', 1)->orderBy('__id');
+        $query12 = $this->repo->query()->where('col1', '!=', 1)->orderBy('__id');
+        $query21 = $repo2->query()->where('col1', '==', 1)->orderBy('__id');
+        $query22 = $repo2->query()->where('col1', '!=', 1)->orderBy('__id');
+
+        // test generating index from document files
+        $this->assertEquals('doc1', $repo2->store($doc1));
+        $this->assertEquals('doc2', $repo2->store($doc2));
+        $this->assertEquals('doc3', $repo2->store($doc3));
+        $this->assertEquals($query21->execute(), $query11->execute());
+        $this->assertEquals($query22->execute(), $query12->execute());
+
+        // test generating index on store document
+        $this->assertEquals('doc4', $this->repo->store($doc4));
+        $this->assertEquals('doc4', $repo2->store($doc4));
+        $this->assertEquals('doc5', $this->repo->store($doc5));
+        $this->assertEquals('doc5', $repo2->store($doc5));
+        $this->assertEquals($query21->execute(), $query11->execute());
+        $this->assertEquals($query22->execute(), $query12->execute());
+    }
+
+    public function testRegenerate()
+    {
+        $id = 'doc1';
+        $doc = new Document(array('col1' => 'val1'));
+        $doc->setId($id);
+        $this->repo->store($doc);
+        $this->assertEquals(array($id), $this->index->get('val1', '=='));
+        $formatter = new JSON();
+        file_put_contents($this->repo->getPathForDocument($id), $formatter->encode(array('col1' => 'val2')));
+        $this->index->regenerate();
+        $this->assertEquals(array(), $this->index->get('val1', '=='));
+        $this->assertEquals(array($id), $this->index->get('val2', '=='));
+    }
+
+}
\ No newline at end of file
diff --git a/test/JamesMoss/Flywheel/QueryExecuterTest.php b/test/JamesMoss/Flywheel/QueryExecuterTest.php
index 19d6e1b..6941ba0 100644
--- a/test/JamesMoss/Flywheel/QueryExecuterTest.php
+++ b/test/JamesMoss/Flywheel/QueryExecuterTest.php
@@ -85,15 +85,15 @@ public function testSubPredicates()
                   ->orWhere('language.0', '==', 'English');
             });
 
-        $qe = new QueryExecuter($this->getRepo('countries'), $pred, array(), array());
+        $qe = new QueryExecuter($this->getRepo('countries'), $pred, array(), array('name ASC'));
 
         $result = $qe->run();
 
         $this->assertEquals(3, $result->total());
 
-        $this->assertEquals('Vatican City', $result->first()->name);
+        $this->assertEquals('Gibraltar', $result->first()->name);
         $this->assertEquals('San Marino', $result[1]->name);
-        $this->assertEquals('Gibraltar', $result[2]->name);
+        $this->assertEquals('Vatican City', $result[2]->name);
     }
 
     public function testInOperator()
@@ -103,17 +103,15 @@ public function testInOperator()
             ->andWhere('population', '<', 40000)
             ->andWhere('language.0', 'IN', array('Italian', 'English'));
 
-        $qe = new QueryExecuter($this->getRepo('countries'), $pred, array(), array());
+        $qe = new QueryExecuter($this->getRepo('countries'), $pred, array(), array('name ASC'));
 
         $result = $qe->run();
 
         $this->assertEquals(3, $result->total());
 
-        $this->assertEquals('Vatican City', $result->first()->name);
-        // The two following assertions doesn't work on PHP 5.4 and 5.5
-        // probably because these versions need mockery 0.* instead of 1.*
-        // $this->assertEquals('San Marino', $result[1]->name);
-        // $this->assertEquals('Gibraltar', $result[2]->name);
+        $this->assertEquals('Gibraltar', $result->first()->name);
+        $this->assertEquals('San Marino', $result[1]->name);
+        $this->assertEquals('Vatican City', $result[2]->name);
     }
 
     public function testSimpleOrdering()
@@ -193,11 +191,44 @@ public function testOrderingById()
         $this->assertEquals('Djibouti', $result[2]->name);
     }
 
+    /**
+     * @dataProvider hashIndexOperatorsProvider
+     */
+    public function testFindByIndex($operator)
+    {
+        $pred = $this->getPredicate()
+            ->where('region', $operator, 'Europe');
+        $options = array(
+            'indexes' => array(
+                'region' => '\JamesMoss\Flywheel\Index\HashIndex'
+            )
+        );
+        $n = 5;
+
+        $qe = new QueryExecuter($this->getRepo('countries', $options), $pred, array(), array());
+        $start = microtime(true);
+        for ($i=0; $i < $n; $i++) {
+            $withIndex = $qe->run();
+        }
+        $timeWithIndex = microtime(true) - $start;
+
+        $qe = new QueryExecuter($this->getRepo('countries'), $pred, array(), array());
+        $start = microtime(true);
+        for ($i=0; $i < $n; $i++) {
+            $withoutIndex = $qe->run();
+        }
+        $timeWithoutIndex = microtime(true) - $start;
 
-    protected function getRepo($repoName)
+        $this->assertSameSize($withoutIndex, $withIndex);
+        $this->assertEqualsUnordered(get_object_vars($withoutIndex), get_object_vars($withIndex));
+        $this->assertLessThan($timeWithoutIndex, $timeWithIndex);
+    }
+
+
+    protected function getRepo($repoName, $options = array())
     {
         $path = __DIR__ . '/fixtures/datastore/querytest';
-        $config = new Config($path . '/');
+        $config = new Config($path . '/', $options);
 
         return new Repository($repoName, $config);
     }
@@ -206,4 +237,12 @@ protected function getPredicate()
     {
         return new Predicate();
     }
+
+    public function hashIndexOperatorsProvider()
+    {
+        return array(
+            array('=='),
+            array('!='),
+        );
+    }
 }
diff --git a/test/JamesMoss/Flywheel/RepositoryTest.php b/test/JamesMoss/Flywheel/RepositoryTest.php
index 164a610..49c192a 100644
--- a/test/JamesMoss/Flywheel/RepositoryTest.php
+++ b/test/JamesMoss/Flywheel/RepositoryTest.php
@@ -6,6 +6,10 @@
 
 class RespositoryTest extends TestBase
 {
+    const REPO_DIR  = '/tmp/flywheel';
+    const REPO_NAME = '_pages';
+    const REPO_PATH = '/tmp/flywheel/_pages/';
+
     /** @var Repository $repo */
     private $repo;
 
@@ -13,12 +17,17 @@ class RespositoryTest extends TestBase
     protected function setUp()
     {
         parent::setUp();
-        
-        if (!is_dir('/tmp/flywheel')) {
-            mkdir('/tmp/flywheel');
+        if (!is_dir(self::REPO_DIR)) {
+            mkdir(self::REPO_DIR);
         }
-        $config = new Config('/tmp/flywheel');
-        $this->repo = new Repository('_pages', $config);
+        $config = new Config(self::REPO_DIR);
+        $this->repo = new Repository(self::REPO_NAME, $config);
+    }
+
+    protected function tearDown()
+    {
+        parent::tearDown();
+        $this->recurseRmdir(self::REPO_PATH);
     }
 
     /**
@@ -26,9 +35,10 @@ protected function setUp()
      */
     public function testValidRepoName($name)
     {
-        $config = new Config('/tmp');
+        $config = new Config(self::REPO_DIR);
         $repo = new Repository($name, $config);
         $this->assertSame($name, $repo->getName());
+        $this->recurseRmdir($repo->getPath());
     }
 
     /**
@@ -37,7 +47,7 @@ public function testValidRepoName($name)
      */
     public function testInvalidRepoName($name)
     {
-        $config = new Config('/tmp');
+        $config = new Config(self::REPO_DIR);
         new Repository($name, $config);
     }
 
@@ -107,7 +117,7 @@ public function testStoringDocuments()
             $repo->store($document);
 
             $name = $i . '.json';
-            $this->assertSame($data, (array) json_decode(file_get_contents('/tmp/flywheel/_pages/' . $name)));
+            $this->assertSame($data, (array) json_decode(file_get_contents(self::REPO_PATH . $name)));
         }
     }
 
@@ -116,7 +126,7 @@ public function testDeletingDocuments()
         $repo   = $this->repo;
         $id     = 'delete_test';
         $name   = $id . '.json';
-        $path   = '/tmp/flywheel/_pages/' . $name;
+        $path   = self::REPO_PATH . $name;
 
         file_put_contents($path, '');
 
@@ -138,7 +148,7 @@ public function testRenamingDocumentChangesDocumentID()
 
         $repo->store($doc);
 
-        rename('/tmp/flywheel/_pages/testdoc123.json', '/tmp/flywheel/_pages/newname.json');
+        rename(self::REPO_PATH . 'testdoc123.json', self::REPO_PATH . 'newname.json');
 
         foreach ($repo->findAll() as $document) {
             if ('newname' === $document->getId()) {
@@ -160,12 +170,32 @@ public function testChangingDocumentIDChangesFilename()
         $doc->setId('test1234');
         $repo->store($doc);
 
-        $this->assertTrue(file_exists('/tmp/flywheel/_pages/test1234.json'));
+        $this->assertTrue(file_exists(self::REPO_PATH . 'test1234.json'));
 
         $doc->setId('9876test');
         $repo->update($doc);
 
-        $this->assertFalse(file_exists('/tmp/flywheel/_pages/test1234.json'));
+        $this->assertFalse(file_exists(self::REPO_PATH . 'test1234.json'));
+    }
+
+    public function testFindByIds()
+    {
+        for ($i=0; $i < 10; $i++) {
+            $doc = new Document(array(
+                'test' => $i,
+            ));
+            $doc->setId("doc$i");
+            $this->repo->store($doc);
+        }
+        $docs = $this->repo->findByIds(array('doc1', 'doc3', 'doc4'));
+        $this->assertCount(3, $docs);
+        $this->assertEquals(1, $docs[0]->test);
+        $this->assertEquals(3, $docs[1]->test);
+        $this->assertEquals(4, $docs[2]->test);
+        $docs = $this->repo->findByIds(array('doc1', 'DOC3', 'doc4'));
+        $this->assertFalse($docs);
+        $docs = $this->repo->findByIds(array());
+        $this->assertCount(0, $docs);
     }
 
     // public function testLockingOnWrite()
diff --git a/test/JamesMoss/Flywheel/TestBase.php b/test/JamesMoss/Flywheel/TestBase.php
index c4bb75b..0505df9 100644
--- a/test/JamesMoss/Flywheel/TestBase.php
+++ b/test/JamesMoss/Flywheel/TestBase.php
@@ -7,5 +7,46 @@ class TestBase extends \PHPUnit\Framework\TestCase
     public function normalizeLineendings($content)
     {
         return str_replace("\r\n", "\n", $content);
-    }    
-}
\ No newline at end of file
+    }
+
+    public function recurseRmdir($dir)
+    {
+        $files = array_diff(scandir($dir), array('.', '..'));
+        foreach ($files as $file) {
+            (is_dir("$dir/$file")) ? $this->recurseRmdir("$dir/$file") : unlink("$dir/$file");
+        }
+        return rmdir($dir);
+    }
+
+    private function arraysEqualsUnordered($a, $b)
+    {
+        // if the indexes don't match, return immediately
+        if (count(array_diff_assoc($a, $b))) {
+            return false;
+        }
+        // we know that the indexes, but maybe not values, match.
+        // compare the values between the two arrays
+        foreach ($a as $k => $v) {
+            if ($v !== $b[$k]) {
+                return false;
+            }
+        }
+        // we have identical indexes, and no unequal values
+        return true;
+    }
+
+    /**
+    * Determine if two associative arrays are similar
+    *
+    * Both arrays must have the same indexes with identical values
+    * without respect to key ordering 
+    * 
+    * @param array $expected
+    * @param array $actual
+    * @return bool
+    */
+    public function assertEqualsUnordered($expected, $actual)
+    {
+        $this->assertTrue($this->arraysEqualsUnordered($expected, $actual));
+    }
+}
diff --git a/test/JamesMoss/Flywheel/fixtures/datastore/querytest/countries/.indexes/region.json b/test/JamesMoss/Flywheel/fixtures/datastore/querytest/countries/.indexes/region.json
new file mode 100644
index 0000000..b521fa8
--- /dev/null
+++ b/test/JamesMoss/Flywheel/fixtures/datastore/querytest/countries/.indexes/region.json
@@ -0,0 +1 @@
+{"Europe":{"Isle of Man_76733f338bb21fd91ee8304d05accb9163ee6e52":1,"Montenegro_479fb34bdbf4aba90d03cca83f64ad4e912cc854":1,"Hungary_f14e46ce7d094f9326167acc499698128651be85":1,"Bosnia and Herzegovina_62ac59b7255ce5ff9fee8ac49157bdd9bc4445e2":1,"Germany_17d53e0e6a68acdf80b78d4f9d868c8736db2cec":1,"Faroe Islands_1082f89115626b9c431f2176f832b3a7cc60fb2c":1,"Monaco_35ab1c3de6dac148401654e1ebf5dd935ccefa14":1,"Romania_d6b897fd145a64fbad36ff7cb1c47a00dcbbe9b6":1,"Netherlands_fb61c8a8eba24117016597fc7618f38821b16e8f":1,"Republic of Kosovo_338e718d14c93382811119b87ed77b25aaed8a98":1,"Russia_6754fe3cd8310d20ed04b8c7b66abebcdb16d88d":1,"France_e3772ac4b4db87b4a8dbfa59ef43cd1a8ad29515":1,"Croatia_d7e0453bb4af87006533f4d77ad9546dac533db8":1,"Estonia_f0a96da3f86a334cbe8d569110d6545277973859":1,"Vatican City_136f5db5de74430b7c1e66fcd4ef0b6a70ace276":1,"Greece_4902a456caa9a4eab463ce526c9df0f6180be184":1,"Belarus_027a12c2fc8568e8b70b07ff536faf288a013670":1,"Andorra_9d3bd1fb52785a7baeb03b437e7b2ecba54ef34f":1,"Macedonia_41349e9557e537855ae0f63cc43918fa13a561d3":1,"Guernsey_180c97abdb80833b91cb32903dced0e8f8b49562":1,"San Marino_87fd3befcce67042618f49ec496c2b09a49459fa":1,"Czech Republic_1fef42909247a6c230eeef66277f2b5e0e8f274e":1,"Svalbard and Jan Mayen_ac99404d12d60aa0c46631720dd7afa750d0e909":1,"Jersey_ff4636d0caf61d70e7dfa437d80aab75e921e76c":1,"Norway_988455e67df7cd81d090ea4bacdc05f39fb7caa5":1,"Portugal_a495190bcc2ef4116725616d321016a7def5bd8f":1,"Iceland_b3c92eecf0aa1905086059d9f6d3261d8fb19657":1,"Moldova_9791bc4d7273587d61fef79841bd342381f5e321":1,"United 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Guiana_07090aa7d613105dad9bd80005cd91b8da1c4cb2":1,"Montserrat_35f005157cfd133875b06f037eeeff3b7494456c":1,"Trinidad and Tobago_4d206a8103d3d20ac685314dbba1c88f6cfedd85":1,"South Georgia_618cd353b39276e0dd2215fabbbbb4d21803a69c":1,"Paraguay_71a45296474d608f35d4b49f3b10384fc738e16f":1,"Bahamas_1f797564f7843d36ebe5e841e5bd39c98157e22b":1,"Saint Lucia_673b1cf863c8e2d10109731b098b19ba81aec9fb":1,"United States Virgin Islands_65f5cb3322400cfd62ba3c8bcffbd7a8d71d0f32":1,"Turks and Caicos Islands_611bc125b7ad66ad9d5103c6bfd968a775763e6c":1,"Haiti_a4842f0234d7270b757b60b6f17a1b9f4d560dad":1,"Falkland Islands_11499959510cbab21e5241a8a6099a3d545b5227":1,"Puerto 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Barbuda_530670dca74039e859436ac4734296b861556efd":1,"Belize_42ab0c94a1e3bd6175a15dba215ccf5f10e861e5":1,"Ecuador_09f199d25132204e99bfb1a89916de24494f19bb":1,"Dominica_bc1cd4f07d828493332f9c95c491d6fb338afd40":1,"Greenland_1ba0cfa550295f8b2c5fa44b8236639adc825cf9":1,"Mexico_41937b20fbe8c71d9c6c3346aff43c001aa25e33":1,"El Salvador_259a6e935b848823a0c0b76aced2803060b4bd0c":1,"Guyana_bc88a24030a15bde613c8749ed93d30e0a81fcc2":1,"Sint Maarten_ad7c3cc73f9cd1c049d3208aac984c49953b94b2":1,"Guatemala_11760e1aac4396e10d315e93ad3df3e99204dc5e":1,"Grenada_dbf2a2da6458b242407285e7f1483aeb6cfee9fd":1,"Martinique_66f1a98a952d50fc3164cde58265772e2ab821c2":1,"Bolivia_a001af75ee89582f31cb4db6d3dd0b4766c80050":1,"Barbados_93409af2f208e7545f0f26996e048113edd88652":1,"Venezuela_9d4ac43d5e24e3d01e448ce01a277ba5971e60f6":1,"Canada_cd6a7b8768528485a0dbcd459185091e80dc28ad":1,"Saint Barthe\u0301lemy_f48e864508243ec01f6ac7ff781f13cd5bde0a0f":1,"Cayman Islands_e9e21c35ab345ef790305554368ebf78279482f2":1,"Brazil_37497aa5a2272c49714aee1b07e8edf973a95f59":1},"Africa":{"Guinea_b47b54fd3a460f43ebbcabe5b10c189176f25f25":1,"Gabon_a06dcd71328fd2b44fa7f84012096e8f318e4b48":1,"Swaziland_c985df0809c3183c074ef84ac9e902d70ff81992":1,"Niger_6687e1896dd857dc1587782149127ff073a95696":1,"Lesotho_93b12bf57f18c13c9ad2f55e33a8e3fd786fc394":1,"Liberia_1ed5dd9d833f675b7509886681e2164d842f8dad":1,"Libya_55949d4c16632f1c275d7684a379b8f1717b3904":1,"Ethiopia_3d91f7631ba813c13a08a208f1255b2e96fb03d0":1,"Democratic Republic of the Congo_f39d28021812d3e91f4c64c9ac055a20d5bcfd30":1,"Morocco_32e087f099be121c1211285a1700ff83542193f7":1,"Cameroon_73a7ddd505f2fc2cead1522e54a794328f228c44":1,"Cape Verde_8e40809e474f3e0705ddef056618ce3e5043522a":1,"Botswana_180c89bf50c8b29deb45e49d9dac62fcd5c8bedb":1,"Seychelles_3d2d7b1c3400e9222f97a999decf652a6c34bdc5":1,"Co\u0302te 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