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https://issues.apache.org/jira/browse/LUCENE-6766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15257807#comment-15257807
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Michael McCandless commented on LUCENE-6766:
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bq. Maybe we can abstract "concat vs merge sort" away
I'm exploring this and it looks like it may be a promising baby step, hopefully
letting us stop using {{SlowCompositeReaderWrapper}} for index sorting...
> Make index sorting a first-class citizen
> ----------------------------------------
>
> Key: LUCENE-6766
> URL: https://issues.apache.org/jira/browse/LUCENE-6766
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6766.patch
>
>
> Today index sorting is a very expert feature. You need to use a custom merge
> policy, custom collectors, etc. I would like to explore making it a
> first-class citizen so that:
> - the sort order could be configured on IndexWriterConfig
> - segments would record the sort order that was used to write them
> - IndexSearcher could automatically early terminate when computing top docs
> on a sort order that is a prefix of the sort order of a segment (and if the
> user is not interested in totalHits).
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