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https://issues.apache.org/jira/browse/LUCENE-6528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14574681#comment-14574681
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Adrien Grand commented on LUCENE-6528:
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Unfortunately that's expected: you need to pass doDocScores=true if you want to
have scores filled in your ScoreDoc instances. Otherwise Lucene just uses
FieldDoc instances instead of ScoreDoc instances with a NaN score and where one
of the sort fields is the score.
However I agree this is confusing, we should try to fix these APIs to not
expose the score if it was not computed.
> Sort by SortField.FIELD_SCORE produces NaN scores
> -------------------------------------------------
>
> Key: LUCENE-6528
> URL: https://issues.apache.org/jira/browse/LUCENE-6528
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 5.1
> Reporter: Ahmet Arslan
> Labels: sort
> Attachments: LUCENE-6528.patch, LUCENE-6528.patch
>
>
> Explicit sort by document score/relevance (SortField.FIELD_SCORE) yields Not
> a Number (NaN) scores.
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