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https://issues.apache.org/jira/browse/SOLR-6909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14264578#comment-14264578
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Ishan Chattopadhyaya commented on SOLR-6909:
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FYI. One idea I was once looking at was to provide the ability of updating a
field value using a javascript expression. SOLR-5979.
Some code is in here,
https://issues.apache.org/jira/secure/attachment/12639276/SOLR-5944.patch (the
"expr" operation, along with "add" and "inc").
> Allow pluggable atomic update merging logic
> -------------------------------------------
>
> Key: SOLR-6909
> URL: https://issues.apache.org/jira/browse/SOLR-6909
> Project: Solr
> Issue Type: Improvement
> Reporter: Steve Davids
> Fix For: 5.0, Trunk
>
> Attachments: SOLR-6909.patch
>
>
> Clients should be able to introduce their own specific merging logic by
> implementing a new class that will be used by the DistributedUpdateProcessor.
> This is particularly useful if you require a custom hook to interrogate the
> incoming document with the document that is already resident in the index as
> there isn't the ability to perform that operation nor can you currently
> extend the DistributedUpdateProcessor to provide the modifications.
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