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https://issues.apache.org/jira/browse/SOLR-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16685206#comment-16685206
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David Smiley commented on SOLR-5211:
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The absence of _root_ on a non-nested doc has been a problem while working on 
SOLR-12638. I think we should just add it, as Oleg proposes for 8.0. Sure; it'd 
be nice to not pay this cost for users that don't need nested docs (and most 
don't need it by far). They can simply omit _root_ though, as well as other 
special nested fields that will appear in 8.0. 8.0 will add _nest_parent_ and 
_nest_path_ to the default schema. Perhaps 8.0 should include a rename of 
_root_ to be _nest_root_ which'll be always populated and we leave out _root_; 
but an "old" schema with _root_ should work as it does today (e.g. the schema 
_either_ has _root_ (old) or _nest_root_ (new) or neither).  CC [~moshebla]

> 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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