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https://issues.apache.org/jira/browse/LUCENE-8832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16857873#comment-16857873
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Andrzej Bialecki commented on LUCENE-8832:
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I think it's basically the same effort, because in both cases it's the same
re-mapping structure in Codec.
> Support for field removal and renaming
> --------------------------------------
>
> Key: LUCENE-8832
> URL: https://issues.apache.org/jira/browse/LUCENE-8832
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
>
> Currently it's not possible to rename existing Lucene fields or delete them
> without creating a new index from scratch (FieldInfos are basically
> append-only).
> This issue proposes to investigate an approach that applies these changes at
> a Codec level so that the unwanted data is skipped over (in case of field
> delete) or accessed under a different name (in case of field rename). Since
> the same Codec API is used for segment merging the deletion / removal
> filtering could be applied only to the currently existing segments because
> the resulting merged segments would not contain this data anymore.
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