Solr has an partial update support, though you need to be careful to
have all fields retrievable (stored or docvalue).
https://cwiki.apache.org/confluence/display/solr/Updating+Parts+of+Documents

Solr also has UpdateRequestProcessor which can do many things,
including scripting.
https://cwiki.apache.org/confluence/display/solr/Update+Request+Processors
I believe, you would need to place it AFTER DistributedUpdateProcessor
if you want to apply it on the whole reconstructed "updated" document
as opposed to just on changes sent.

Regards,
   Alex.
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On 17 November 2016 at 18:06, Dorian Hoxha <dorian.ho...@gmail.com> wrote:
> Hi,
>
> Is there an "add and limit" update modifier (couldn't find in docs) ? If
> not, can I run a script to update a document (still couldn't find anything)
> ? If not, how should I do that  (custom plugin? )?
>
> Thank You

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