Fix Indices.BulkAsync summary #2061

Job	Run time
Integration OpenSearch (2.11.1)	7m 32s
Integration OpenSearch Unreleased (1.x)	10m 12s
Integration OpenSearch (2.10.0)	7m 21s
Integration OpenSearch Unreleased (2.x)	12m 33s
Integration OpenSearch (2.8.0)	7m 29s
Integration OpenSearch Unreleased (main)	18m 34s
Integration OpenSearch (2.6.0)	6m 36s
Integration OpenSearch (2.4.1)	7m 4s
Integration OpenSearch (2.2.1)	6m 44s
Integration OpenSearch (2.0.1)	6m 54s
Integration OpenSearch (1.3.14)	6m 51s
Integration OpenSearch (1.2.4)	7m 12s
Integration OpenSearch (1.1.0)	6m 42s
	1h 51m 44s

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