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https://issues.apache.org/jira/browse/LUCENE-9206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17031055#comment-17031055
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Robert Muir commented on LUCENE-9206:
-------------------------------------

For this command-line tool I will push to master only, with verbage in 
CHANGES.txt/MIGRATE.txt to pass {{--max-segments 1}} if you rely upon the old 
behavior.

> 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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