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https://issues.apache.org/jira/browse/SOLR-12441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16524728#comment-16524728
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Jan Høydahl commented on SOLR-12441:
------------------------------------

It's not important what the child IDs are, could be some generated GUID as 
well, that varies every time the block is reindexed, but it may be easier to 
spot the doc's origin if the generated id has some known structure.

> 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: 2h 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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