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https://issues.apache.org/jira/browse/LUCENE-5481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless reopened LUCENE-5481:
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I'll backport to 4.7.x
> IndexWriter.forceMerge may run unneeded merges
> ----------------------------------------------
>
> Key: LUCENE-5481
> URL: https://issues.apache.org/jira/browse/LUCENE-5481
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.8
>
> Attachments: LUCENE-5481.patch
>
>
> I was running some tests and was surprised that {{IndexWriter.forceMerge}}
> caused the index to be merged even when the index contains a single segment
> with no deletions.
> This is due to {{MergePolicy.isMerged}} which always returns false with the
> default configuration although merge policies rely on it to know whether a
> single-segment index should be merged.
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