Hoss Man created SOLR-11942:

             Summary: need better ref guide docs on join (and grouping) 
limitations in solr cloud
                 Key: SOLR-11942
                 URL: https://issues.apache.org/jira/browse/SOLR-11942
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: documentation
            Reporter: Hoss Man

on irc, a user asked about joining in solr cloud and i realized that the 
"JoinQParser" docs don't really clarify what does/doesn't work in cloud.  There 
is a section on "Joining Across Collections" which points out some limitations 
in cloud mode, and the "Result Grouping" page has a brief note that "a...ll 
documents in each group must be co-located on the same shard in order for 
accurate counts to be returned. Document routing via composite keys can be a 
useful solution in many situations."  But there is no similar warning for using 
the join parser n a single collection.

We should probably beef up the warning on the "Result Grouping" section to give 
an example of what does/doesn't work, and cross link to that from the "join" 
parser docs? (ie: "Note that when using multiple shards, the {{join}} parser 
has similar limitations as  {{the GroupComponent regarding co-located 
documents|LINK_TO_OTHER_DOC}} )

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