Fix Elasticsearch function test (#7547)

Fixes #7452

Author: sebastienros

tests/Aspire.Elastic.Clients.Elasticsearch.Tests/AspireElasticClientExtensionsTest.cs

@@ -140,9 +140,10 @@ public void CanAddClientFromEncodedConnectionString()
 
     [Fact]
     [RequiresDocker]
-    [ActiveIssue("https://github.com/dotnet/aspire/issues/7452")]
     public void ElasticsearchInstrumentationEndToEnd()
     {
+        // RemoteExecutor is used because OTEL uses a static instance to capture activities
+
         RemoteExecutor.Invoke(async (connectionString) =>
         {
             var builder = CreateBuilder(connectionString);
@@ -162,7 +163,8 @@ public void ElasticsearchInstrumentationEndToEnd()
             Assert.Single(activityList);
 
             var activity = activityList[0];
-            Assert.Equal("ping", activity.OperationName);
+            Assert.Equal("ping", activity.DisplayName);
+            Assert.Equal("HEAD", activity.OperationName);
             Assert.Contains(activity.Tags, kvp => kvp.Key == "db.system" && kvp.Value == "elasticsearch");
         }, DefaultConnectionString, new RemoteInvokeOptions { TimeOut = 120_000 }).Dispose();
     }