[6.4] [ML] Improves bucket span estimator stability. (#21282) #21331
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- Fixes the bucket span estimator when median is selected as a detector function. agg.type.name is median and therefor not usable for an Elasticsearch aggregation. agg.type.dslName is percentile and is the correct mapping. .dslName is also used for the aggregations used for the preview charts. - 7.0 will introduce a search.max_buckets setting which defaults to 10000. This could lead to failing bucket estimations because the values used for creating the required aggregations could result in more buckets. This PR fixes it by taking search.max_buckets into account when calculating the time range used for the bucket estimation. (Since 6.2 that setting is available so backporting this to current unreleased minor releases 6.4 and 6.5)
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Backports the following commits to 6.4: