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https://issues.apache.org/jira/browse/SOLR-5142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13758043#comment-13758043
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Yonik Seeley commented on SOLR-5142:
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bq. Don't you feel unique key should be optional for children documents?
unique keys are for more than just implementing overwriting though - they are
needed for things like distributed search.
> Block Indexing / Join Improvements
> ----------------------------------
>
> Key: SOLR-5142
> URL: https://issues.apache.org/jira/browse/SOLR-5142
> Project: Solr
> Issue Type: Improvement
> Reporter: Yonik Seeley
> Fix For: 4.5, 5.0
>
>
> Follow-on main issue for general block indexing / join improvements
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