Percolation against same non-changed docs?

I understand the concept of how docs are checked against existing
percolators. One thing I am not clear on, does elasticSearch run against
percolators again for same un-changed documents?

I just indexed 5 million docs and ran it against all percolators.
The next day, I ran the same 5 million docs again, does it check against
the percolators again, or is it smart enough to know these are same docs?
is percolating done in-memory, so it doesn't take a lot of time to get
matches back?


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