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https://issues.apache.org/jira/browse/SOLR-15064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17261326#comment-17261326
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Thomas Wöckinger commented on SOLR-15064:
-----------------------------------------

Thx for the hint, i was already thinking about that, maybe this trick is worth 
to be mentioned in documentation under 
[https://nightlies.apache.org/Lucene/Solr-reference-guide-master/updating-parts-of-documents.html]

> Atomic/partial updates to nested docs should not assume _route_ param is the 
> root ID
> ------------------------------------------------------------------------------------
>
>                 Key: SOLR-15064
>                 URL: https://issues.apache.org/jira/browse/SOLR-15064
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: David Smiley
>            Assignee: David Smiley
>            Priority: Minor
>              Labels: NestedDocuments
>
> In SOLR-14923, doing an atomic/partial update to a child doc requires 
> indicating what the root doc ID is.  Formerly Solr tried to figure this out 
> automatically, but that had costly implications.   SOLR-14923 adds a 
> temporary hack that assumes that the \_route_ paramter *is* the root ID, if 
> the \_root_ field is not on the doc.  But that's not necessarily accurate, so 
> it should be removed.
>  



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