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https://issues.apache.org/jira/browse/LUCENE-1584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12718231#action_12718231
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Jason Rutherglen commented on LUCENE-1584:
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We can make it protected that way it's expert level and a user
needs to inherit from IndexWriter to use it. I don't think today
it's possible to simply inherit from IW to get the merge
information because IW.merge is final, and there needs to be a
way to know the merge was successful.
> Callback for intercepting merging segments in IndexWriter
> ---------------------------------------------------------
>
> Key: LUCENE-1584
> URL: https://issues.apache.org/jira/browse/LUCENE-1584
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4.1
> Reporter: Jason Rutherglen
> Priority: Minor
> Attachments: LUCENE-1584.patch
>
> Original Estimate: 96h
> Remaining Estimate: 96h
>
> For things like merging field caches or bitsets, it's useful to
> know which segments were merged to create a new segment.
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