Using _score in custom filters score query

I want to use filters in my search, each one with a query that results in a
score. I then want to use score_mode 'total' to combine the filter scores.

I do want to control the scores of each filter (and query within it), but
using the original score of the query inside a filter. I want the script of
the filter to be something like Script("_score * 50/100").

This way I can set the weightage of each filter in the overall search score.

However using _score in the filter script of a custom_filters_score is not
allowed. How can I get the original score of a filter (and its inner query)
computed by ElasticSearch, which I can use as base for my custom score for
a filter?

Any help is greatly appreciated.

Thanks & Regards,
Aditya.

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