Optimize lone single bucket date_histogram
(backport of #71180)
#72989
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This optimizes the
date_histogram
agg when there is a single bucketand no sub-aggregations. We expect this to happen from time to time when
the buckets are larger than a day because folks often use "daily"
indices.
This was already fairly fast, but using the metadata makes it 10x
faster. Something like 98ms becomes 7.5ms. Nice if you can get it!
Like #69377 this optimization will disable itself if you have document
level security enabled or are querying a rollup index. Also like #69377
it won't do anything if there is a top level query.