Adding support for term filter lookup http://www.elasticsearch.org/blog/terms-filter-lookup/
Since ES 1.0.0 field values, in response to the fields parameter, are now always returned as arrays. 

They recommend the _source field to be used.
Merge pull request #1 from doximity/indexed_terms_field_support

Adding support for term filter lookup http://www.elasticsearch.org/blog/terms-filter-lookup/