add store to timestamp field mapping

Author: Ashley Mannix

src/Nest/Domain/Mapping/SpecialFields/TimestampFieldMapping.cs

@@ -22,6 +22,9 @@ public interface ITimestampFieldMapping : ISpecialField
 
 		[JsonProperty("ignore_missing")]
 		bool? IgnoreMissing { get; set; }
+		
+		[JsonProperty("store")]
+		bool Store { get; set; }
 	}
 
 	public class TimestampFieldMapping : ITimestampFieldMapping
@@ -33,6 +36,7 @@ public class TimestampFieldMapping : ITimestampFieldMapping
 		public string Format { get; set; }
 		public string Default { get; set; }
 		public bool? IgnoreMissing { get; set; }
+		public bool Store { get; set; }
 	}
 
 
@@ -47,12 +51,20 @@ public class TimestampFieldMappingDescriptor<T> : ITimestampFieldMapping
 		string ITimestampFieldMapping.Format { get; set; }
 		string ITimestampFieldMapping.Default { get; set; }
 		bool? ITimestampFieldMapping.IgnoreMissing { get; set; }
+		bool ITimestampFieldMapping.Store { get; set; }
 
 		public TimestampFieldMappingDescriptor<T> Enabled(bool enabled = true)
 		{
 			Self.Enabled = enabled;
 			return this;
 		}
+		
+		public TimestampFieldMappingDescriptor<T> Store(bool store = false)
+		{
+			Self.Store = store;
+			return this;
+		}
+		
 		public TimestampFieldMappingDescriptor<T> Path(string path)
 		{
 			Self.Path = path;
@@ -85,4 +97,4 @@ public TimestampFieldMappingDescriptor<T> IgnoreMissing(bool ignoreMissing = tru
 
 
 	}
-}
+}