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https://issues.apache.org/jira/browse/LUCENE-6695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-6695:
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Attachment: LUCENE-6695.patch
Here is a patch: it computes the aggregated doc freq from several terms as the
maximum doc freq, and the total term freq as the sum of the total term freqs of
individual terms.
I put the query in lucene/core so that TopTermsBlendedFreqScoringRewrite could
reuse it and marked it as experimental, but if someone is not comfortable with
it I can revert the changes to TopTermsBlendedFreqScoringRewrite and move this
query to the sandbox.
> BlendedTermQuery
> ----------------
>
> Key: LUCENE-6695
> URL: https://issues.apache.org/jira/browse/LUCENE-6695
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-6695.patch
>
>
> It is sometimes desirable to ignore differences between index statistics of
> several terms so that they produce the same scores, for instance if you
> resolve synonyms at search time or if you want to search across several
> fields. Elasticsearch has been using this approach for its multi_match query
> for some time now.
> We already blend statistics in TopTermsBlendedFreqScoringRewrite (used by
> FuzzyQuery) but it could be helpful to have a dedicated query to choose
> manually which terms to blend stats from.
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