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https://issues.apache.org/jira/browse/LUCENE-8409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16547319#comment-16547319
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Alexandre Rafalovitch commented on LUCENE-8409:
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I seem to remember the discussion about doing segment-by-segment rewrite with
some sort of filtered reader that would clear the remove fields in process. But
I cannot find the discussion of whether it was fully relevant.
But yes I agree that it is quite problematic in terms of index evolution.
> Cannot delete individual fields from index
> ------------------------------------------
>
> Key: LUCENE-8409
> URL: https://issues.apache.org/jira/browse/LUCENE-8409
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Cetra Free
> Priority: Major
>
> This is based upon the following tickets:
> https://issues.apache.org/jira/browse/SOLR-12185
> https://issues.apache.org/jira/browse/LUCENE-8235
> I'd like a way to be able to clear and recreate a specific field so I don't
> have to completely reindex if I change a field type.
> It's a real pain if you change a specific field from single valued to
> multivalued, you have to delete the entire index from disk and start from
> scratch.
> As being able to modify a field is not an [intended
> feature|https://issues.apache.org/jira/browse/LUCENE-8235?focusedCommentId=16530918&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16530918],
> It'd be preferable if a field could be at least deleted and recreated to
> deal with this scenario.
>
>
>
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