Is there an easy way (even if not entirely accurate) to estimate the size
of an individual filter in the filter cache if we know the approximate
number of documents the index holds? Realize it's a bit tricky as filter
cache is node-level, not index-level by default.
If it were straight non-sparse bitset then a filter would be n-bits in
size: 1B documents = 1B bits = 125MB but I'm guessing ES tries to use a
more clever implementation of a bitset.
Aspiring Digital Carpenter
p: +1 (416) 953-4248
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