Add support for the new data_* roles. (#5085)

Our integration tests were failing calling the `nodes.info` API because
it could not map `data_cold` to this enum.

Author: Mpdreamz

src/Nest/Cluster/NodesInfo/NodeRole.cs

@@ -17,6 +17,18 @@ public enum NodeRole
 		[EnumMember(Value = "data")]
 		Data,
 
+		[EnumMember(Value = "data_cold")]
+		DataCold,
+
+		[EnumMember(Value = "data_content")]
+		DataContent,
+
+		[EnumMember(Value = "data_hot")]
+		DataHot,
+
+		[EnumMember(Value = "data_warm")]
+		DataWarm,
+
 		[EnumMember(Value = "client")]
 		Client,