Shalin Shekhar Mangar commented on SOLR-13320:

If the definition of duplicate is just having the same id then that can also be 
done today using optimistic concurrency. Use `_version_` with a negative value. 

If duplicate depends on the content of the document then you need to use the 

> add a param ignoreDuplicates=true to updates to not overwrite existing docs
> ---------------------------------------------------------------------------
>                 Key: SOLR-13320
>                 URL: https://issues.apache.org/jira/browse/SOLR-13320
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>            Priority: Major
> Updates should have an option to ignore duplicate documents and drop them if 
> an option  {{ignoreDuplicates=true}} is specified

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