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https://issues.apache.org/jira/browse/LUCENE-6589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15008306#comment-15008306
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Adrien Grand commented on LUCENE-6589:
--------------------------------------

[~mkhludnev] We already require a block of documents to be entirely reindexed 
when adding or modifying a child document, so I think it's consistent to also 
have this requirement when deleting a child?

In addition, this is required after the simplifications from LUCENE-6553: now 
that live docs are applied on top of the query, we would only check if the 
parent doc IDs are live if you run a ToParentBlockJoinQuery, never the children.

> Less leniency in lucene/join
> ----------------------------
>
>                 Key: LUCENE-6589
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6589
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Priority: Minor
>             Fix For: 5.3
>
>         Attachments: LUCENE-6589.patch, LUCENE-6589.patch
>
>
> The lucene/join module expects a certain index structure but nothing 
> validates it. Then at search time it either needs to validate the index 
> structure in a slow way or be lenient and cope with what it is given.



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