Mikhail Khludnev created SOLR-5211:
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             Summary: updating parent as childless makes old children orphans
                 Key: SOLR-5211
                 URL: https://issues.apache.org/jira/browse/SOLR-5211
             Project: Solr
          Issue Type: Sub-task
          Components: update
    Affects Versions: 4.5, 5.0
            Reporter: Mikhail Khludnev


if I have parent with children in the index, I can send update omitting 
children. as a result old children become orphaned. 
I suppose separate \_root_ fields makes much trouble. I propose to extend 
notion of uniqueKey, and let it spans across blocks that makes updates 
unambiguous.  
WDYT? Do you like to see a test proves this issue?

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