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Today the default precision for the cardinality aggregation depends on how many parent bucket aggregations it had. The reasoning was that the more parent bucket aggregations, the more buckets the cardinality had to be computed on. And this number could be huge depending on what the parent aggregations actually are. However now that we run terms aggregations in breadth-first mode by default when there are sub aggregations, it is less likely that we have to run the cardinality aggregation on kagilions of buckets. So we could use a static default, which will be less confusing to users.