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From Mikhail Khludnev <>
Subject Re: How can I use FunctionScoreQuery to replace CustomScoreQuery?
Date Sat, 26 Jan 2019 20:11:32 GMT
You can see how DoubleValuesSource.FieldValuesSource reads numeric field.
Custom code can read string identifier, and run custom logic, then it can
wrap a query with FunctionScoreQuery.boostByValue(Query,

On Sat, Jan 26, 2019 at 7:01 PM MarcoR <>

> Hi,
> Based on everything I read so far, FunctionScoreQuery is the way forward
> for
> boosting.
> My problem is, even though CustomScoreQuery's documentation suggests that
> FunctionScoreQuery should be used instead, I cannot find a way to use
> FunctionScoreQuery in the same way I can use CustomScoreQuery.
> Specifically, getCustomScopeProvider method of FunctionScoreQuery allows me
> to provide custom score logic which provides access to document identifier,
> which then lets me apply document specific logic.
> I could not find a way to do the same using FunctionScoreQuery. I looked at
> various ways of building a DoubleValuesSource but I simply got lost in the
> documentation and codebase. My guess is there should be a way to wrap the
> per document scoring logic as a DoubleValuesSource. Am I right? If so, what
> is the approach I should use?
> I have a case in which I can use a phrase query to match documents of
> interest but then I'd like to change their scores based on complex logic
> that lucene-expression would not be sufficient for.
> I want to use a FunctionScoreQuery to avoid use of an obselete query type,
> but I'm stuck.
> --
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Sincerely yours
Mikhail Khludnev

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