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https://issues.apache.org/jira/browse/LUCENE-9206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17030654#comment-17030654
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Erick Erickson commented on LUCENE-9206:
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+1, in the default case this should be near instantaneous?
FWIW, IndexUpgraderTool also forcemerges to 1 segment, but the fix there would
be more complicated 'cause at least TMP won't rewrite segments that are already
max sized. And that's a whole 'nother Jira anyway.
> 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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