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https://issues.apache.org/jira/browse/SOLR-7490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14520812#comment-14520812
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Erick Erickson commented on SOLR-7490:
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Problem here is that you don't necessarily have any source to re-index from.
Solr doesn't (yet) have any update-in-place, atomic updates only work if all
source fields are stored. So this could only possibly work if all the fields in
the docs were stored, and could well result in a _massive_ amount of work being
done by Solr as the result of a single call.
I guess it might be possible to accommodate this with the updatable docValues,
but again that would be a restricted use-case.
It feels like the restrictions are too onerous to make this something that
would generate a lot of interest. I'm not opposed to the idea, mind you, but I
_do_ need to be persuaded that it's worth the complexity.
And how that would all play with distributed updates and optimistic locking I
don't know.
> Update by query feature
> -----------------------
>
> Key: SOLR-7490
> URL: https://issues.apache.org/jira/browse/SOLR-7490
> Project: Solr
> Issue Type: New Feature
> Reporter: Praneeth
> Priority: Minor
>
> An update feature similar to the {{deleteByQuery}} would be very useful. Say,
> the user wants to update a field of all documents in the index that match a
> given criteria. I have encountered this use case in my project and it looks
> like it could be a useful first class solr/lucene feature. I want to check if
> this is something we would want to support in coming releases of Solr and
> Lucene, are there scenarios that will prevent us from doing this,
> feasibility, etc.
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