Add a working neural search sample #1667

Job	Run time
Integration OpenSearch Unreleased (1.x)	9m 30s
Integration OpenSearch (2.11.1)	6m 56s
Integration OpenSearch (2.10.0)	6m 51s
Integration OpenSearch Unreleased (2.x)	16m 49s
Integration OpenSearch (2.8.0)	6m 38s
Integration OpenSearch Unreleased (main)	16m 28s
Integration OpenSearch (2.6.0)	6m 24s
Integration OpenSearch (2.4.1)	6m 16s
Integration OpenSearch (2.2.1)	5m 59s
Integration OpenSearch (2.0.1)	7m 49s
Integration OpenSearch (1.3.14)	6m 43s
Integration OpenSearch (1.2.4)	6m 12s
Integration OpenSearch (1.1.0)	6m 5s
	1h 48m 40s

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