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https://issues.apache.org/jira/browse/LUCENE-8200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395875#comment-16395875
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Michael McCandless commented on LUCENE-8200:
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+1, patch looks great; I left a minor comment on the github commit. Amazing
how little code the change requires, and it's a nice approach for soft deletes.
> Allow doc-values to be updated atomically together with a document
> -------------------------------------------------------------------
>
> Key: LUCENE-8200
> URL: https://issues.apache.org/jira/browse/LUCENE-8200
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.4, master (8.0)
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Major
> Attachments: LUCENE-8200.patch
>
>
> Today we can only update a document by deleting all previously indexed
> documents for the given term. In some cases like when deletes are not `final`
> in the way that documents that are marked as deleted should not be merged
> away a `soft-delete` is needed which is possible when doc-values updates can
> be done atomically just like delete and add in updateDocument(s)
>
> This change introduces such a soft update that reuses all code paths from
> deletes to update all previously updated documents for a given term instead
> of marking it as deleted. This is a spinnoff from LUCENE-8198
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