Integration with Unreleased OpenSearch

Fix serialization of nested aggregates under `SingleBucketAggregateBase` #2053

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Run time

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Job	Run time
test (1.x, 11)	3m 43s
test (2.x, 11, 17)	4m 4s
test (2.x, 17)	3m 53s
test (2.x, 21)	3m 47s
test (main, 11, 17)	3m 27s
test (main, 17)	3m 37s
test (main, 21)	4m 20s
	26m 51s