Fix compilation errors

Author: Mpdreamz

src/Elasticsearch.Net/Extensions/X509CertificateExtensions.cs

@@ -1,10 +1,14 @@
-namespace Elasticsearch.Net
+#if DOTNETCORE
+using System.Security.Cryptography.X509Certificates;
+#endif
+
+namespace Elasticsearch.Net
 {
 	internal static class X509CertificateExtensions
 	{
 #if DOTNETCORE
 
-// https://referencesource.microsoft.com/#mscorlib/system/security/cryptography/x509certificates/x509certificate.cs,318
+		// https://referencesource.microsoft.com/#mscorlib/system/security/cryptography/x509certificates/x509certificate.cs,318
 		internal static string GetCertHashString(this X509Certificate certificate)
 		{
 			var bytes = certificate.GetCertHash();

src/Tests/Tests.Core/Client/Settings/TestConnectionSettings.cs

@@ -40,6 +40,10 @@ public TestConnectionSettings(
 		private static string LocalHost => "localhost";
 
 		internal ConnectionSettings ApplyTestSettings() => EnableDebugMode()
+			//TODO make this random
+			//.EnableHttpCompression()
+#if DEBUG
+			.EnableDebugMode()
 #endif
 			.ConnectionLimit(ConnectionLimitDefault)
 			.OnRequestCompleted(r =>