Add support for indices.stats #2104

Job	Run time
Integration OpenSearch (2.11.1)	8m 15s
Integration OpenSearch (2.10.0)	7m 21s
Integration OpenSearch (2.8.0)	7m 9s
Integration OpenSearch (2.6.0)	6m 47s
Integration OpenSearch (2.4.1)	6m 24s
Integration OpenSearch (2.2.1)	6m 11s
Integration OpenSearch Unreleased (1.x)	6m 28s
Integration OpenSearch (2.0.1)	6m 13s
Integration OpenSearch Unreleased (2.x)	12m 51s
Integration OpenSearch (1.3.14)	6m 38s
Integration OpenSearch Unreleased (main)	7m 14s
Integration OpenSearch (1.2.4)	6m 30s
Integration OpenSearch (1.1.0)	6m 43s
	1h 34m 44s

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