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https://issues.apache.org/jira/browse/SOLR-12181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16437172#comment-16437172
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Andrzej Bialecki  commented on SOLR-12181:
------------------------------------------

[~dsmiley] the aboveOp / belowOp are configurable but you would have to pass 
additional parameters in the CREATE command, which is not yet supported (but it 
wouldn't be difficult to add this support). For now the primary use case for 
this trigger is to automatically split and merge shards as the index size grows 
/ gets smaller.

> Add trigger based on document count
> -----------------------------------
>
>                 Key: SOLR-12181
>                 URL: https://issues.apache.org/jira/browse/SOLR-12181
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling
>    Affects Versions: master (8.0)
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: SOLR-12181.patch
>
>
> This may turn out to be as simple as using a {{MetricTrigger}} but it's 
> likely this will require some specialization, and we may want to add this 
> type of trigger anyway for convenience.
> The two control actions associated with this trigger will be SPLITSHARD and 
> (yet nonexistent) MERGESHARD.



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