lots of duplicate records-- rebuild index?

[smrgeoinfo]

e.g. http://search.geothermaldata.org/dataset?q=%22power+plant%22&sort=score+desc%2C+metadata_modified+desc shows 2 of each result

http://search.geothermaldata.org/dataset?q=%22power+plant%22 shows 4 of each result.

Will rebuilding the search index fix this?