Michael McCandless created LUCENE-7927:

             Summary: Add facets impl to count unique numeric values
                 Key: LUCENE-7927
                 URL: https://issues.apache.org/jira/browse/LUCENE-7927
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 7.1

The facets module has multiple facet methods for counting flat and hierarchical 
fields, and also a method for counting numeric ranges.  I'd like to also add a 
method that counts unique numeric (long) values, designed to be used for fields 
that have only a few, typically low valued, numbers across the index e.g. a 
"review" rating from 1 to 5.

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