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https://issues.apache.org/jira/browse/LUCENE-9206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17030658#comment-17030658
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Robert Muir commented on LUCENE-9206:
-------------------------------------
It will do some merges, maybe some big long ones: addIndexes() calls
maybeMerge() at the end. But it will not be pathological and merge down to just
one segment unless you ask.
> improve IndexMergeTool
> ----------------------
>
> Key: LUCENE-9206
> URL: https://issues.apache.org/jira/browse/LUCENE-9206
> Project: Lucene - Core
> Issue Type: Task
> Components: general/tools
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-9206.patch
>
>
> This tool can have performance problems since it will only force merge the
> index down to one segment. Let's give it some better options and default
> behavior.
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