How to get query term vectors using scripts?

Elastic Stack Elasticsearch
1

I'm using scripts to implement some custom score function like:

∑is_ge_1(_index['FIELD']['TERM'].tf()) / my_query.termvectors('ANALYZER').size()
where TERM is one of my_query.termvectors(), and FIELD can be passed from script params.

I'm able to get _index['FIELD']['TERM'].tf() according to the docs.

But how can I get the whole query term vectors just like _analyzer API?
I've googled this before but didn't get something useful. Only lucene v3.5 has QueryTermVector API.
Or if there's some other better approaches to implement this?

Thank you in advance.

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