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https://issues.apache.org/jira/browse/LUCENE-4472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473626#comment-13473626
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Simon Willnauer commented on LUCENE-4472:
-----------------------------------------
The MergePolicy is tricky here since we clone the MP in IW you need to actually
pull and cast the MP from IW to change the setting if you want to do this in
realtime. Maybe we can add something like this to MP so we can change
MergeSettings in RT too. Otherwise you need to build a special MP but we can
certainly do that.
> Add setting that prevents merging on updateDocument
> ---------------------------------------------------
>
> Key: LUCENE-4472
> URL: https://issues.apache.org/jira/browse/LUCENE-4472
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4472.patch
>
>
> Currently we always call maybeMerge if a segment was flushed after
> updateDocument. Some apps and in particular ElasticSearch uses some hacky
> workarounds to disable that ie for merge throttling. It should be easier to
> enable this kind of behavior.
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