[jira] [Created] (LUCENE-7833) Returning minimum instead of maximum in ToParentBlockJoinQuery.BlockJoinScorer.setScoreAndFreq

["Bernhard Altendorfer (JIRA)" <ji...@apache.org>]

Bernhard Altendorfer created LUCENE-7833:
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             Summary: Returning minimum instead of maximum 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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