opensearchapi: add template client to root client #1067

Job	Run time
integration-test-compatibility (true, 1.1.0)	1m 3s
integration-test-compatibility (true, 1.2.4)	1m 5s
integration-test-compatibility (true, 1.3.8)	1m 7s
integration-test-compatibility (true, 2.0.1)	1m 7s
integration-test-compatibility (true, 2.1.0)	1m 18s
integration-test-compatibility (true, 2.2.1)	58s
integration-test-compatibility (true, 2.3.0)	1m 0s
integration-test-compatibility (true, 2.4.1)	1m 21s
integration-test-compatibility (true, 2.5.0)	1m 18s
integration-test-compatibility (true, 2.6.0)	1m 13s
integration-test-compatibility (true, 2.7.0)	1m 34s
integration-test-compatibility (true, 2.8.0)	1m 40s
integration-test-compatibility (false, 1.1.0)	1m 27s
integration-test-compatibility (false, 1.2.4)	1m 22s
integration-test-compatibility (false, 1.3.8)	1m 40s
integration-test-compatibility (false, 2.0.1)	1m 30s
integration-test-compatibility (false, 2.1.0)	1m 22s
integration-test-compatibility (false, 2.2.1)	1m 34s
integration-test-compatibility (false, 2.3.0)	1m 31s
integration-test-compatibility (false, 2.4.1)	1m 55s
integration-test-compatibility (false, 2.5.0)	1m 40s
integration-test-compatibility (false, 2.6.0)	1m 48s
integration-test-compatibility (false, 2.7.0)	1m 53s
integration-test-compatibility (false, 2.8.0)	1m 43s
	34m 9s

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