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https://issues.apache.org/jira/browse/LUCENE-7713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888405#comment-15888405
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Adrien Grand commented on LUCENE-7713:
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I played with sorting the geonames dataset on the population field and
disabling the compareBottom call after {{numHits}} documents have been
collected, which reduced the query time from 92ms to 17ms (5x faster) so I
think such a change could yield serious speedups for users who would still want
to compute the total number of hits (which means early termination is not an
option).
> Optimize TopFieldDocCollector for the sorted case
> -------------------------------------------------
>
> Key: LUCENE-7713
> URL: https://issues.apache.org/jira/browse/LUCENE-7713
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
>
> When the sort order is a prefix of the index sort order,
> {{TopFieldDocCollector}} could skip reading doc values and comparing them
> against the bottom value after {{numHits}} documents have been collected, and
> just count matches.
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