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https://issues.apache.org/jira/browse/LUCENE-5883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096786#comment-14096786
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Michael McCandless commented on LUCENE-5883:
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+1, thanks Shai!
> Move MergePolicy to LiveIndexWriterConfig
> -----------------------------------------
>
> Key: LUCENE-5883
> URL: https://issues.apache.org/jira/browse/LUCENE-5883
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-5883.patch, LUCENE-5883.patch
>
>
> Since LUCENE-5711, MergePolicy is no longer wired to an IndexWriter instance.
> Therefore it can be moved to be a live setting on IndexWriter, which will
> allow apps to plug-in an MP on a live IW instance, without closing/reopening
> the writer. See for example LUCENE-5526 - instead of adding MP to forceMerge,
> apps could change the MP before calling forceMerge, with e.g. an
> UpgradeIndexMergePolicy.
> I think we can also make MergeScheduler a live setting, though I currently
> don't see the benefits of doing that, so I'd rather not touch it now.
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