Add new allocation explain response properties added in ES 5.2.1

Author: gmarz

src/Nest/Cluster/ClusterAllocationExplain/ClusterAllocationExplainResponse.cs

@@ -240,8 +240,23 @@ public enum StoreCopy
 	[JsonObject]
 	public class AllocationStore
 	{
-		[JsonProperty("shard_copy")]
-		public StoreCopy ShardCopy { get; set; }
+		[JsonProperty("found")]
+		public bool? Found { get; set; }
+
+		[JsonProperty("in_sync")]
+		public bool? InSync { get; set; }
+
+		[JsonProperty("allocation_id")]
+		public string AllocationId { get; set; }
+
+		[JsonProperty("matching_sync_id")]
+		public bool? MatchingSyncId { get; set; }
+
+		[JsonProperty("matching_size_in_bytes")]
+		public long? MatchingSizeInBytes { get; set; }
+
+		[JsonProperty("store_exception")]
+		public string StoreException { get; set; }
 	}
 
 	[JsonObject]