Performance trick? how

I have to calculate a difference between "number of results" vs. "number of
results for a slightly modified query".

The "number of results is known", and I am using the "/_count" API to get
the number of results of "slightly modified query".

Problem is, I have to run many such "slightly modified queries", one for
each displayed facet => 50 "/_count" queries. The difference in numbers
will show user how many results he will get after clicking on a facet.

The queries are almost identical -- is there a way to leverage this fact?
Some caching hints? Submit all queries to ES at once, instead of calling
/_count fifty times?

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