Adrien Grand created LUCENE-5526:
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             Summary: Forced merges
                 Key: LUCENE-5526
                 URL: https://issues.apache.org/jira/browse/LUCENE-5526
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Priority: Minor


{{IndexWriter.forceMerge}} allows to force merges if the number of segments is 
higher than a configured limit. I would like to have the ability to also force 
a merge if there is a single segment in the directory. This is possible today 
by closing the IndexWriter, reopening with a custom merge policy such as 
{{UpgradeIndexMergePolicy}}, running a {{forceMerge}} and finally reopening 
again with the original merge policy but this is a bit impractical and if 
possible I would like to be able to do it without reopening the writer twice.





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