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https://issues.apache.org/jira/browse/LUCENE-7276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15328347#comment-15328347
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Michael McCandless commented on LUCENE-7276:
--------------------------------------------
Wow thank you for digging on this [~jim.ferenczi] ... I've been meaning to get
back to this issue, and if we can fix that scoring issue (separately) that will
make it much easier.
> Add an optional reason to the MatchNoDocsQuery
> ----------------------------------------------
>
> Key: LUCENE-7276
> URL: https://issues.apache.org/jira/browse/LUCENE-7276
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Ferenczi Jim
> Priority: Minor
> Labels: patch
> Attachments: LUCENE-7276.patch, LUCENE-7276.patch, LUCENE-7276.patch,
> LUCENE-7276.patch, LUCENE-7276.patch
>
>
> It's sometimes difficult to debug a query that results in a MatchNoDocsQuery.
> The MatchNoDocsQuery is always rewritten in an empty boolean query.
> This patch adds an optional reason and implements a weight in order to keep
> track of the reason why the query did not match any document. The reason is
> printed on toString and when an explanation for noMatch is asked.
> For instance the query:
> new MatchNoDocsQuery("Field not found").toString()
> => 'MatchNoDocsQuery["field 'title' not found"]'
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