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https://issues.apache.org/jira/browse/SOLR-12633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16613555#comment-16613555
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David Smiley commented on SOLR-12633:
-------------------------------------

This boolean was only useful to disambiguate how to attach a child document in 
JSON when the "split" param is used, since in that scenario there's no way to 
say which way you want to attach it. In 8.0 we can simply assume it'll happen 
the new field-attached way. Ultimately the distinction doesn't have a material 
effect on the final result for current/legacy schemas (indexes the same); it 
just exposes this metadata during the URP stages should it be 
useful/interesting there. New schemas that have _nest_path_ require this 
metadata. The flag was "safe" in case we accidentally did harm – perhaps due to 
custom URPs. In 8.0 we can always attach as a field.

> JSON Loader: remove anonChildDoc option
> ---------------------------------------
>
>                 Key: SOLR-12633
>                 URL: https://issues.apache.org/jira/browse/SOLR-12633
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: David Smiley
>            Priority: Major
>             Fix For: master (8.0)
>
>
> In 8.0/master, we should drop "anonChildDocs" that we added.  It was a 
> temporary flag.  Assume it's not anonymous unless the field name is 
> {{\_childDocuments_\}}.  That exception to the rule should have been added 
> already but was overlooked.



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