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https://issues.apache.org/jira/browse/SOLR-12441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540915#comment-16540915
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Hoss Man commented on SOLR-12441:
---------------------------------

I'm late to the party, and haven't tried to catch up on the issue too much 
(stoked you guys are working on this though!) but ... i have a small bit of 
bike-shedding to ask about...

why are these new field names upper case?  wouldn't lower case be more 
consistent with the existing special fields like {{\_root\_}} and 
{{\_version\_}} ?

{noformat}
+  public static final String NEST_PARENT_FIELD_NAME = "_NEST_PARENT_";
+  public static final String NEST_PATH_FIELD_NAME = "_NEST_PATH_";
{noformat}

(i couldn't find any comment that seemed to mention the upper casing being a 
conscious choice compared to the original {{\_nestParent\_}} etc... -- although 
+1 to removing the camel case either way)

> 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
>             Fix For: 7.5
>
>          Time Spent: 7.5h
>  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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