David Smiley created LUCENE-8965:
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             Summary: ConcurrentMergeScheduler should maybe sometimes do 
synchronously
                 Key: LUCENE-8965
                 URL: https://issues.apache.org/jira/browse/LUCENE-8965
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/index
            Reporter: David Smiley
            Assignee: David Smiley


It can be beneficial for the ConcurrentMergeScheduler to sometimes _not_ do 
concurrent merges (i.e. sometimes do a serial merge).  When the provided 
"OneMerge" is _small_ and when the MergeTrigger is FULL_FLUSH (i.e. on a 
commit), a new searcher would benefit from seeing fewer segments.  If index 
replication is used, this setting can reduce the net replication by merging a 
little more eagerly sometimes.



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