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https://issues.apache.org/jira/browse/LUCENE-7833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16015375#comment-16015375
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selckin commented on LUCENE-7833:
---------------------------------
[~jpountz]
https://github.com/apache/lucene-solr/blob/master/lucene/join/src/java/org/apache/lucene/search/join/ToParentBlockJoinQuery.java#L315
> Calculating minimum score instead of maximum score in
> ToParentBlockJoinQuery.BlockJoinScorer.setScoreAndFreq
> ------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-7833
> URL: https://issues.apache.org/jira/browse/LUCENE-7833
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Bernhard Altendorfer
>
> We recently upgraded our Elasticsearch cluster from 5.3 to 5.4 and found a
> bug when we score nested documents.
> I spent some time to check the code from Elasticsearch and Lucene and I found
> a problem in ToParentBlockJoinQuery.BlockJoinScorer.setScoreAndFreq.
> In the switch statement for the scoreMode in the case "Max" the function
> Math.min is used and I guess it should be Math.max.
> This would explain our problem in Elasticsearch because we see exactly the
> problem that instead of the maximum the minimum is returned.
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