David Smiley created SOLR-13129:
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             Summary: Document nested child docs in the ref guide
                 Key: SOLR-13129
                 URL: https://issues.apache.org/jira/browse/SOLR-13129
             Project: Solr
          Issue Type: Sub-task
      Security Level: Public (Default Security Level. Issues are Public)
          Components: documentation
    Affects Versions: 8.0
            Reporter: David Smiley
             Fix For: 8.0


Solr 8.0 will have nicer support for nested child documents than its 
predecessors.  This should be documented in one place in the ref guide (to the 
extent that makes sense). Users need to the schema ramifications (incl. special 
fields and that some aspects are optional and when), what a nested document 
"looks like" (XML, JSON, SolrJ), how to use the child doc transformer, how to 
use block join queries, and get some overview of how this all works.  Maybe 
mention some plausible future enhancements / direction this is going in (e.g. 
path query language?).  Some of this is already done but it's in various places 
and could be moved.  Unlike other features which conveniently fit into one spot 
in the documentation (like a query parser), this is a more complex issue that 
has multiple aspects – more "cross-cutting", and so IMO doesn't belong in the 
current doc pigeon holes.



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