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https://issues.apache.org/jira/browse/SOLR-3862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507703#comment-13507703
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Jim Musil commented on SOLR-3862:
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So, I needed to hack this together to suit my needs. I'm not sure if anyone
else would find this useful, but I've added a "removeAll" option for atomic
updates. It just uses String.removeAll() on each value, so supplying regex as
the value will work. I've never submitted a patch before, so please forgive me
if I've done this wrong.
> add "remove" as update option for atomically removing a value from a
> multivalued field
> --------------------------------------------------------------------------------------
>
> Key: SOLR-3862
> URL: https://issues.apache.org/jira/browse/SOLR-3862
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 4.0-BETA
> Reporter: Jim Musil
>
> Currently you can atomically "add" a value to a multivalued field. It would
> be useful to be able to "remove" a value from a multivalued field.
> When you "set" a multivalued field to null, it destroys all values.
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