Add missing ClusterStateInfo.cs

Author: NickCraver

src/Nest/Enums/ClusterStateInfo.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Nest
+{
+    [Flags]
+    public enum ClusterStateInfo
+    {
+        All = 0,
+        ExcludeNodes = 1 << 1,
+        ExcludeRoutingTable = 1 << 2,
+        ExcludeMetadata = 1 << 3,
+        ExcludeBlocks = 1 << 4
+    }
+}