diff --git a/pkg/tsdb/elasticsearch/elasticsearch.go b/pkg/tsdb/elasticsearch/elasticsearch.go
index 8f74c47a4a5..70683ab3aea 100644
--- a/pkg/tsdb/elasticsearch/elasticsearch.go
+++ b/pkg/tsdb/elasticsearch/elasticsearch.go
@@ -88,6 +88,11 @@ func newInstanceSettings() datasource.InstanceFactoryFunc {
 			return nil, fmt.Errorf("error getting http options: %w", err)
 		}
 
+		// Set SigV4 service namespace
+		if httpCliOpts.SigV4 != nil {
+			httpCliOpts.SigV4.Service = "es"
+		}
+
 		version, err := coerceVersion(jsonData["esVersion"])
 
 		if err != nil {