Fix tests

Author: flobernd

tests/Tests/ClientConcepts/OpenTelemetry/OpenTelemetryTests.cs

@@ -40,9 +40,9 @@ public async Task BasicOpenTelemetryTest()
 
 		await client.SearchAsync<Project>(s => s.Index("test").Query(q => q.MatchAll(m => { })));
 
-		VerifyActivity(oTelActivity, "search", "GET", "http://localhost:9200/test/_search?pretty=true&error_trace=true");
+		VerifyActivity(oTelActivity, "search", "POST", "http://localhost:9200/test/_search?pretty=true&error_trace=true");
 
-		static void VerifyActivity(Activity oTelActivity, string operation, string displayName, string url = null)
+		static void VerifyActivity(Activity oTelActivity, string displayName, string operation, string url = null)
 		{
 			oTelActivity.Should().NotBeNull();
 
@@ -53,13 +53,13 @@ static void VerifyActivity(Activity oTelActivity, string operation, string displ
 
 			oTelActivity.Tags.Should().Contain(n => n.Key == "elastic.transport.product.name" && n.Value == "elasticsearch-net");
 			oTelActivity.Tags.Should().Contain(n => n.Key == "db.system" && n.Value == "elasticsearch");
-			oTelActivity.Tags.Should().Contain(n => n.Key == "db.operation" && n.Value == operation);
+			oTelActivity.Tags.Should().Contain(n => n.Key == "db.operation" && n.Value == displayName);
 			oTelActivity.Tags.Should().Contain(n => n.Key == "db.user" && n.Value == "elastic");
 			oTelActivity.Tags.Should().Contain(n => n.Key == "url.full" && n.Value == (url ?? "http://localhost:9200/?pretty=true&error_trace=true"));
 			oTelActivity.Tags.Should().Contain(n => n.Key == "server.address" && n.Value == "localhost");
-			oTelActivity.Tags.Should().Contain(n => n.Key == "http.request.method" && n.Value == (operation == "ping" ? "HEAD" : "POST"));
+			oTelActivity.Tags.Should().Contain(n => n.Key == "http.request.method" && n.Value == (displayName == "ping" ? "HEAD" : "POST"));
 
-			switch (operation)
+			switch (displayName)
 			{
 				case "search":
 					oTelActivity.Tags.Should().Contain(n => n.Key == "db.elasticsearch.path_parts.index" && n.Value == "test");