Question

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?

Answer 1

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.