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https://issues.apache.org/jira/browse/LUCENE-8004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16583215#comment-16583215
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Erick Erickson commented on LUCENE-8004:
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This was an offshoot of LUCENE-8264, and made the same assumption, that a full
rewrite from Lucene X-2 > Lucene X-1 -> Lucene X was possible and making
IndexUpgrader rewrite all segments while respecting MaxMergedSegmentMB would
facilitate that process. Since the assumption was mistaken, I want to close
this as "Won't fix" unless there are objections.
> IndexUpgraderTool should rewrite segments rather than forceMerge
> ----------------------------------------------------------------
>
> Key: LUCENE-8004
> URL: https://issues.apache.org/jira/browse/LUCENE-8004
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Priority: Major
>
> Spinoff from LUCENE-7976. We help users get themselves into a corner by using
> forceMerge on an index to rewrite all segments in the current Lucene format.
> We should rewrite each individual segment instead. This would also help with
> upgrading X-2->X-1, then X-1->X.
> Of course the preferred method is to re-index from scratch.
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