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https://issues.apache.org/jira/browse/LUCENE-4472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473264#comment-13473264
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selckin commented on LUCENE-4472:
---------------------------------
+1, if you have a lot of indexes and they all start merging at the same time it
can be quite taxing
I think ES has dedicated configurable thread pool where for each index a
maybeMerge() is scheduled on an interval. (Size of thread pool limits number of
concurrent merges)
> 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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