Elasticsearch support (MVP)

[danslapman]

Elasticsearch support

Querying:

• boolean
• term
• terms
• terms set (?)
• exists
• prefix
• range
• regexp
• wildcard (?)
• nested - needs to be considered during DSL designing
• unchecked

Mapping:

• mapping definition can be generated from queryMeta DSL
• as many field types as possible should be supported

Other features:

• extensive boolean query optimizations
• shrink ranges
• aggregation pipelines - simultaneously with mongodb

Off-score (for MVP):

• full text queries - requires a separate DSL
• scoring - maybe in future versions, requires a separate DSL

Legend:
(?) - easy to implement, but not essential