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https://issues.apache.org/jira/browse/SOLR-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16688130#comment-16688130
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David Smiley commented on SOLR-5211:
------------------------------------

RE my pondering of the dubious necessity of adding \_version\_ to child docs: 
SOLR-10114 -- delete-by-query is done in a way that assumes all documents have 
a version.... at least this is true for _reordered_ DBQs according to that 
issue.  So it must stay.

BTW it won't be as simple as I suggested to rename \_root\_ since there are 
lots of tests referencing it.  We can certainly keep the name, but assume in 
8.0 (when this gets committed) that \_root\_ is completely populated by any 
code that needs to make this assumption by doing a version check.

> updating parent as childless makes old children orphans
> -------------------------------------------------------
>
>                 Key: SOLR-5211
>                 URL: https://issues.apache.org/jira/browse/SOLR-5211
>             Project: Solr
>          Issue Type: Sub-task
>          Components: update
>    Affects Versions: 4.5, 6.0
>            Reporter: Mikhail Khludnev
>            Assignee: Mikhail Khludnev
>            Priority: Major
>         Attachments: SOLR-5211.patch, SOLR-5211.patch, SOLR-5211.patch
>
>
> if I have parent with children in the index, I can send update omitting 
> children. as a result old children become orphaned. 
> I suppose separate \_root_ fields makes much trouble. I propose to extend 
> notion of uniqueKey, and let it spans across blocks that makes updates 
> unambiguous.  
> WDYT? Do you like to see a test proves this issue?



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