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https://issues.apache.org/jira/browse/LUCENE-4472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473265#comment-13473265
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Shai Erera commented on LUCENE-4472:
------------------------------------

Patch looks good. One minor comment -- LiveIWC.setMaybeMergeAfterFlush() 
contains a redundant 'a' in its javadocs --> ".. after a each segment".

bq. Maybe the setting should mean we never call maybeMerge implicitly?

Perhaps the issue's description should change to "Add setting to prevent 
merging on segment flush". Because as I understand the fix, the check is made 
only after a segment has been flushed, which already covers 
addDocument/updateDocument as well as future field updates?
                
> 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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