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https://issues.apache.org/jira/browse/LUCENE-5545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944169#comment-13944169
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Uwe Schindler commented on LUCENE-5545:
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+1 very nice!
> Add ExpressionRescorer
> ----------------------
>
> Key: LUCENE-5545
> URL: https://issues.apache.org/jira/browse/LUCENE-5545
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.8, 5.0
>
> Attachments: LUCENE-5545.patch, LUCENE-5545.patch, LUCENE-5545.patch,
> LUCENE-5545.patch
>
>
> In LUCENE-5489 we added QueryRescorer, to rescore first-pass hits using
> scores from a (usually) more expensive second-pass query.
> I think we should also add ExpressionRescorer, to compute the second pass
> score using an arbitrary JS expression.
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