CODEWITHSUNDEEP
elasticsearch
Commander
Commander

Reputation: 1322

How to get the current score of a document before calculating custom score

I am creating a custom script in Java for scoring documents. I am looking to try and get the document's score prior to going into the custom scorer.

In mvel it seems that you can just do: "_score * doc['my_numeric_field'].value / pow(param1, param2)"

and _score will just give you the score. I don't see any effective way of getting the score with the Java API.

Note: I've tried doc().getScore() and that seems to always give a null pointer exception.

Bonus: How would I be able to get other document fields such as _boost or _index?

Upvotes: 1

Views: 1136

Answers (1)

imotov
imotov

Reputation: 30163

The native script equivalent of "_score * doc['my_numeric_field'].value / pow(param1, param2)" would be: 

@Override
public float runAsFloat() {
    return score() * doc().numeric("my_numeric_field").getFloatValue() / divider;
}

you can calculate pow(param1, param2) in the factory method since it doesn't change between runAsFloat() executions.

If _index field is enabled, it can be accessed like this: 

doc().field("_index").getStringValue()

I would recommend using query time boosting instead of index time boosting.

Upvotes: 2

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