Bump version to 1.9.0 #2201

Job	Run time
Integration OpenSearch (2.16.0)	7m 3s
Integration OpenSearch (2.14.0)	6m 59s
Integration OpenSearch (2.12.0)	7m 3s
Integration OpenSearch (2.10.0)	6m 33s
Integration OpenSearch Unreleased (1.x, 11)	4m 51s
Integration OpenSearch (2.8.0)	6m 37s
Integration OpenSearch Unreleased (2.x, 17)	10m 31s
Integration OpenSearch (2.6.0)	6m 2s
Integration OpenSearch Unreleased (main, 21)	5m 39s
Integration OpenSearch (2.4.1)	5m 33s
Integration OpenSearch (2.2.1)	4m 47s
Integration OpenSearch (2.0.1)	4m 45s
Integration OpenSearch (1.3.14)	5m 13s
Integration OpenSearch (1.2.4)	4m 43s
Integration OpenSearch (1.1.0)	4m 29s
	1h 30m 48s

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