aparo/pyes — pull request #448 by julianhille (2014-08-13 12:53:10+00:00)
Title: Added TermsLookup class in utils and possiblity to add it to TermsFilter

Took the information from here and added them to the new classes.
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-terms-filter.html#_terms_lookup_mechanism