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https://issues.apache.org/jira/browse/SOLR-12441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16526177#comment-16526177
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Jan Høydahl commented on SOLR-12441:
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{quote}Perhaps we could specify in the documentation that these values can only
be added in child documents which contain an id?
{quote}
That sounds fragile. In practice it means that no-one will trust the auto id
feature because it can bomb on you anytime a sub doc contains some not-known
field name. I like better a requirement for a list - guess that's the most
common use of child docs anyway. Why would you want a single child doc, which
could be expressed as fields on the main doc instead?
> 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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