Christine Poerschke created SOLR-15496:
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             Summary: LTRRescorer unnecessarily (re)creates ScoreDoc Comparator 
objects
                 Key: SOLR-15496
                 URL: https://issues.apache.org/jira/browse/SOLR-15496
             Project: Solr
          Issue Type: Task
          Components: ltr
            Reporter: Christine Poerschke


Discovered by [~mdrob] whilst reviewing SOLR-14920 changes:

A static instance of the comparator(s) could be created and reused.

* 
https://github.com/apache/solr/blob/af0455ac8366d6dba941f2b2674ed2a8245c76f9/solr/contrib/ltr/src/java/org/apache/solr/ltr/LTRRescorer.java#L133-L162
* https://github.com/apache/solr/pull/189#discussion_r657360363





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