Multiplying scores in 7.0

We are currently multiplying a set of normalized values during queries by using the fact that log(a*b) = log(a) + log(b):

  "field_value_factor": {
    "field": "keywords_en.score",
    "factor": 1,
    "modifier": "log"

This will cause negative values which triggers a deprecation warning (and an error in 7.0)

How can we continue to do what basically amounts to multiplied scores in 7.0?

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