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https://issues.apache.org/jira/browse/LUCENE-8832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16857801#comment-16857801
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Erick Erickson commented on LUCENE-8832:
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WDYT about splitting this into two tasks? Would it be simpler/faster to deal
with the deletions, then the renames? Or is it the case that doing them both at
the same time is very little extra effort?
Up to you of course, just wondering....
> 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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