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https://issues.apache.org/jira/browse/LUCENE-8298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16467604#comment-16467604
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Michael McCandless commented on LUCENE-8298:
--------------------------------------------
+1, very cool! My favorite part of the patch is:
{quote}<b>just don't do it!</b>{quote}
:)
Curiously, Lucene long ago had the ability to undelete a document! It was a
method on {{IndexReader}} to undelete all documents (that had not been
reclaimed by merges yet), and now we get that ability back, but in the right
place ({{IndexWriter}}) and with control over which doc to un-soft-delete.
> Allow DocValues updates to reset a value
> ----------------------------------------
>
> Key: LUCENE-8298
> URL: https://issues.apache.org/jira/browse/LUCENE-8298
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.4, master (8.0)
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: LUCENE-8298.patch, LUCENE-8298.patch
>
>
> Today once a document has a value in a certain DV field this values
> can only be changed but not removed. While resetting / removing a value
> from a field is certainly a corner case it can be used to undelete a
> soft-deleted document unless it's merged away.
> This allows to rollback changes without rolling back to another
> commitpoint
> or trashing all uncommitted changes. In certain cenarios it can be used to
> "repair" history of documents in distributed systems.
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