Adrien Grand 5c237fe834 Add new option min_doc_count to terms and histogram aggregations.
`min_doc_count` is the minimum number of hits that a term or histogram key
should match in order to appear in the response.

`min_doc_count=0` replaces `compute_empty_buckets` for histograms and will
behave exactly like facets' `all_terms=true` for terms aggregations.

Close #4662
2014-01-13 10:09:38 +01:00
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