Lucene 4.8.0 grouping API

Lucene's grouping module

See: Description

Packages 
Package Description
org.apache.lucene.search.grouping
This module enables search result grouping with Lucene, where hits with the same value in the specified single-valued group field are grouped together.
org.apache.lucene.search.grouping.function
Support for grouping by ValueSource.
org.apache.lucene.search.grouping.term
Support for grouping by indexed terms via FieldCache.

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