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https://issues.apache.org/jira/browse/SOLR-15064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17260896#comment-17260896
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Thomas Wöckinger commented on SOLR-15064:
-----------------------------------------

The update of the child document is completely clear when using composite id 
routing, but if no prefix can be used is it sufficient to add the root document 
id as prefix?

> 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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