Random_score always returns 0

Elastic Stack Elasticsearch
1

Hi,
I was having problems combining random_score with other scoring functions,
until I noticed using the "explain" feature that apparently random_score
always returns 0, no matter the seed or document.
Here is some more info:

    "query": {

        "function_score": {

            "functions": [

                {

                    "random_score" : {

                    }

                }

            ]

        }

    }

Explain always gives this for the random_score function:

{"value":0.0,"description":"random score function (seed: -830865530)"}

I've tried many variations and different seeds, but the result is always
the same.
Could someone enlighten me as to what's happening, or help me debug this
further?

Thanks!
Max

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