CloudWatch : Add missing AWS/ES metrics (#85210)

Adding missing ES metrics

Author: thepalbi

pkg/tsdb/cloudwatch/constants/metrics.go

@@ -135,6 +135,7 @@ var NamespaceMetricsMap = map[string][]string{
 		"IndexingLatency",
 		"IndexingRate",
 		"InvalidHostHeaderRequests",
+		"IopsThrottle",
 		"JVMGCOldCollectionCount",
 		"JVMGCOldCollectionTime",
 		"JVMGCYoungCollectionCount",
@@ -187,6 +188,7 @@ var NamespaceMetricsMap = map[string][]string{
 		"MasterOldGenJVMMemoryPressure",
 		"MasterReachableFromNode",
 		"MasterSysMemoryUtilization",
+		"MaxProvisionedThroughput",
 		"Nodes",
 		"OldGenJVMMemoryPressure",
 		"OpenSearchDashboardsConcurrentConnections",