Fix tests: version parsing failed against ES 1.4.0.Beta1

Author: gmarz

src/Tests/Nest.Tests.Integration/ElasticsearchConfiguration.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics;
+using System.Linq;
 using Elasticsearch.Net.Connection.Thrift;
 using Elasticsearch.Net;
 
@@ -59,8 +60,10 @@ public static string NewUniqueIndexName()
 		public static Version GetCurrentVersion()
 		{
 			dynamic info = Client.Value.Raw.Info().Response;
-			var version = Version.Parse(info.version.number);
-
+			var versionString = (string)info.version.number;
+			if (versionString.Contains("Beta"))
+				versionString = string.Join(".", versionString.Split('.').Where(s => !s.StartsWith("Beta", StringComparison.OrdinalIgnoreCase)));
+			var version = Version.Parse(versionString);
 			return version;
 		}
 	}