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https://issues.apache.org/jira/browse/LUCENE-9206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17030664#comment-17030664
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Erick Erickson commented on LUCENE-9206:
----------------------------------------

You know how it is when you hit "send" and immediately realize you've missed 
the obvious? I do that a lot ;).

Hmmm. I suppose you could specify NoMergePolicy if you really cared, but then 
you might leave a lot of segments laying around or maybe create a backlog of 
merges that you'd hit as soon as you started indexing again.

Regardless, this patch gives a lot more control over the process where there 
was none before, way cool.

> 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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