We're currently evaluating Elasticsearch, and trying to get a handle on the approximate counts that it uses. I know that in cardinality aggregations, the default value for 'precision_threshold' is 3000. I think this means that if I get back a number that is 3000 or less, then it should be an exact answer.
My question is about for other types of counts. Is the same thing true for those? Or are there any queries (e.g. Top 10 queries, etc) where it's not true -- could I get a value back of 40, when the actual answer is 41 or 42?