Does ES by default cache the query result?

Elastic Stack Elasticsearch
1

I know ES could cache the filter result, but how about query result, especially the hits result?

2

No. Filters are cached.
Why are you asking that? Do you have an issue?

3

We are running performance test against our ES cluster using Jmeter with simple settings:
20 user load
target throughput 1000 QPS
10 different query request.

The average response time is around 8 ms after 1 hour running. The 8 ms PLT is so good that I even cannot believe it. So I was wondering if the result of frequent query request was cached.