[exporter/elasticsearch] Update README (#32221) #33

Job	Run time
collector-build	6m 49s
docker-build	7m 10s
supervisor-test	1m 6s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 42s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 19s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 19s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 10s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 45s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 40s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 20s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 12s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 45s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 25s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 18s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 16s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 48s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 37s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 10s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 27s
kubernetes-test	1s
	1h 22m 19s

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