make sure we use the nodes from the cluster again, this was failing the x-pack cluster tests because we no longer went over http

(cherry picked from commit 1cb6609)

Author: Mpdreamz

src/Tests/Tests.Core/Extensions/EphemeralClusterExtensions.cs

@@ -13,7 +13,9 @@ public static class EphemeralClusterExtensions
 		public static ConnectionSettings CreateConnectionSettings<TConfig>(this IEphemeralCluster<TConfig> cluster)
 			where TConfig : EphemeralClusterConfiguration
 		{
-			return new TestConnectionSettings();
+			var clusterNodes = cluster.NodesUris(TestConnectionSettings.LocalOrProxyHost);
+			//we ignore the uri's that TestConnection provides and seed with the nodes the cluster dictates.
+			return new TestConnectionSettings(uris => new StaticConnectionPool(clusterNodes));
 		}
 
 		public static IElasticClient GetOrAddClient<TConfig>(

src/Tests/Tests.Core/ManagedElasticsearch/Clusters/XPackCluster.cs

@@ -41,7 +41,7 @@ protected virtual ConnectionSettings Authenticate(ConnectionSettings s) => s
 		protected virtual ConnectionSettings ConnectionSettings(ConnectionSettings s) => s
 			.ServerCertificateValidationCallback(CertificateValidations.AllowAll);
 
-		public virtual IElasticClient Client => this.GetOrAddClient(s=>this.Authenticate(this.ConnectionSettings(ConnectionSettingsExtensions.ApplyDomainSettings(s))));
+		public virtual IElasticClient Client => this.GetOrAddClient(s=> this.Authenticate(this.ConnectionSettings(s.ApplyDomainSettings())));
 
 		protected override void SeedCluster() => new DefaultSeeder(this.Client).SeedNode();
 	}