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https://issues.apache.org/jira/browse/SOLR-11191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439075#comment-16439075
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Peng Xing commented on SOLR-11191:
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Hi [~varunthacker], I have met the same problem with you, after splitting the 
rested document shard, it will lost index data, maybe after splitting, the 
parent document has been send to shard1_0, the child document has been send to 
shard1_1, so the child document has not find its parent, then it will be 
invalid to be lost.
Have you found some method to avoid this problem? thanks!

> Shard Split doesn't work on indexes that have nested documents
> --------------------------------------------------------------
>
>                 Key: SOLR-11191
>                 URL: https://issues.apache.org/jira/browse/SOLR-11191
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Varun Thacker
>            Priority: Major
>
> The split shard command doesn't split a shard correctly when the index has 
> parent-child documents.
> The way split shard works is it goes through all documents id's in that shard 
> and then decides which sub-shard would it belong in . It is not aware of the 
> parent child relationship during this process
> So the parent-child documents could be orphaned and end up in different shard
> Secondly, even with the routing of parent and child documents were the same 
> split shards needs to re-index them as a block



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