David Smiley created LUCENE-8049:
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             Summary: IndexWriter.getMergingSegments should return a Set, not 
Collection
                 Key: LUCENE-8049
                 URL: https://issues.apache.org/jira/browse/LUCENE-8049
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/index
            Reporter: David Smiley
            Assignee: David Smiley
            Priority: Minor


IndexWriter.getMergingSegments is called by the MergePolicy so that it can 
filter out segments to merge using mergingSegments.contains(seg).  The 
implementation is a HashSet, thankfully but the declared type of this method 
ought to be defined as a Set as well.



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