Adrien Grand created LUCENE-8412:
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             Summary: Remove trackDocScores from TopFieldCollector factory 
methods
                 Key: LUCENE-8412
                 URL: https://issues.apache.org/jira/browse/LUCENE-8412
             Project: Lucene - Core
          Issue Type: Task
            Reporter: Adrien Grand


Computing scores on top hits is fine, but the current way it is implemented - 
at collection time - requires to read/decode more freqs/norms and compute more 
scores than necessary. It would be more efficient to compute scores of top hits 
as a post-collection step by only advancing the scorer to hits that made the 
top-N list.



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