[jira] [Resolved] (LUCENE-8298) Allow DocValues updates to reset a value

["Simon Willnauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-8298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer resolved LUCENE-8298.
-------------------------------------
    Resolution: Fixed

> 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, LUCENE-8298.patch, 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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