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https://issues.apache.org/jira/browse/SOLR-12441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16522510#comment-16522510
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David Smiley commented on SOLR-12441:
-------------------------------------

Can you please provide further justification for \_nestLevel\_ like a more 
fleshed out scenario?  It seems to only be a matter of query convenience based 
on your description (i.e. there are other ways to accomplish the same query), 
and we're paying index weight for it (albeit small) so I don't quite see if 
it's worth it.

> Add deeply nested documents URP
> -------------------------------
>
>                 Key: SOLR-12441
>                 URL: https://issues.apache.org/jira/browse/SOLR-12441
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: mosh
>            Assignee: David Smiley
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> As discussed in 
> [SOLR-12298|https://issues.apache.org/jira/browse/SOLR-12298], there ought to 
> be an URP to add metadata fields to childDocuments in order to allow a 
> transformer to rebuild the original document hierarchy.
> {quote}I propose we add the following fields:
>  # __nestParent__
>  # _nestLevel_
>  # __nestPath__
> __nestParent__: This field wild will store the document's parent docId, to be 
> used for building the whole hierarchy, using a new document transformer, as 
> suggested by Jan on the mailing list.
> _nestLevel_: This field will store the level of the specified field in the 
> document, using an int value. This field can be used for the parentFilter, 
> eliminating the need to provide a parentFilter, which will be set by default 
> as "_level_:queriedFieldLevel".
> _nestLevel_: This field will contain the full path, separated by a specific 
> reserved char e.g., '.'
>  for example: "first.second.third".
>  This will enable users to search for a specific path, or provide a regular 
> expression to search for fields sharing the same name in different levels of 
> the document, filtering using the level key if needed.
> {quote}



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