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https://issues.apache.org/jira/browse/LUCENE-9935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17363008#comment-17363008
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Nhat Nguyen commented on LUCENE-9935:
-------------------------------------
Thanks [~rcmuir]. The change for term vectors hasn't backported to 8.x yet. I
am looking into the test failure caused by the changes in term vectors.
> Bulk merges for stored fields when index sorting is enabled
> -----------------------------------------------------------
>
> Key: LUCENE-9935
> URL: https://issues.apache.org/jira/browse/LUCENE-9935
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Nhat Nguyen
> Priority: Minor
> Fix For: 8.9, 9.0
>
> Time Spent: 4h 50m
> Remaining Estimate: 0h
>
> Today stored fields disable bulk merges entirely when index sorting is
> enabled. However when sorting by low-cardinality fields or when the index
> sort is correlated with the order in which documents get indexed, we could
> likely still have efficient bulk merges.
> For instance, if you are merging two segments that are sorted on a field that
> can only take 2 values, one could bulk merge the first half of the first
> segment, then the first half of the second segment, then the second half of
> the first segment, and finally the second half of the second segment.
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