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https://issues.apache.org/jira/browse/LUCENE-5647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14279911#comment-14279911
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Robert Muir commented on LUCENE-5647:
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We can easily apply the same algorithm as LUCENE-6183 so the optimization will
be effective and not a rare one. I think we should remove the existing logic
completely for that, falling back to the default algorithm otherwise. I can
investigate this tomorrow.
We should think about implementing getMergeInstance() like LUCENE-6115, so that
the fallback default algorithm is reasonable for all other cases.
> disable current term vectors bulk merge
> ---------------------------------------
>
> Key: LUCENE-5647
> URL: https://issues.apache.org/jira/browse/LUCENE-5647
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: 4.9, Trunk
>
>
> See LUCENE-5646 for the motivation.
> Long term it might be nice to add algorithm #2 to term vectors if its
> possible and not too complex.
> But for now, I think we should avoid such rare optimizations.
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