Add missing allocation decision enum values

This commit adds missing allocation decision enum values, based on https://github.com/elastic/elasticsearch/blob/5.6/core/src/main/java/org/elasticsearch/cluster/routing/allocation/AllocationDecision.java

Fixes #3210

Author: russcam

src/Nest/Cluster/ClusterAllocationExplain/ClusterAllocationExplainResponse.cs

@@ -251,7 +251,25 @@ public enum Decision
 		Yes,
 
 		[EnumMember(Value = "no")]
-		No
+		No,
+
+		[EnumMember(Value = "worse_balance")]
+		WorseBalance,
+
+		[EnumMember(Value = "throttled")]
+		Throttled,
+
+		[EnumMember(Value = "awaiting_info")]
+		AwaitingInfo,
+
+		[EnumMember(Value = "allocation_delayed")]
+		AllocationDelayed,
+
+		[EnumMember(Value = "no_valid_shard_copy")]
+		NoValidShardCopy,
+
+		[EnumMember(Value = "no_attempt")]
+		NoAttempt
 	}
 
 	[JsonConverter(typeof(StringEnumConverter))]

src/Tests/Reproduce/GithubIssue3210.cs

@@ -0,0 +1,57 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Threading;
+using System.Threading.Tasks;
+using Elasticsearch.Net;
+using Nest;
+using Tests.Framework;
+using Tests.Framework.Integration;
+using Xunit;
+using FluentAssertions;
+
+namespace Tests.Reproduce
+{
+	public class GithubIssue3210
+	{
+		private const string ClusterAllocationResponse = @"{
+  ""index"" : ""idx"",
+	""shard"" : 0,
+	""primary"" : true,
+	""current_state"" : ""unassigned"",
+	""unassigned_info"" : {
+		""reason"" : ""INDEX_CREATED"",
+		""at"" : ""2017-01-04T18:08:16.600Z"",
+		""last_allocation_status"" : ""no""
+	},
+	""can_allocate"" : ""no"",
+	""allocate_explanation"" : ""cannot allocate because allocation is not permitted to any of the nodes"",
+	""node_allocation_decisions"" : [
+		{
+			""node_id"": ""_3APDoyWQUGJC2J_LbxQVw"",
+			""node_name"": ""node"",
+			""transport_address"": ""10.10.10.10:9300"",
+			""node_attributes"": {
+				""ml.max_open_jobs"": ""10"",
+				""rack_id"": ""2"",
+				""ml.enabled"": ""true"",
+				""machinetype"": ""warm""
+			},
+			""node_decision"": ""worse_balance"",
+			""weight_ranking"": 4
+		}
+	]
+}";
+
+		[U] public void MissingNodeDecisionOptionsInResponseThrowExceptionWhenAttemptingToDeserializeResponse()
+		{
+			var client = TestClient.GetFixedStringResponseClient(ClusterAllocationResponse);
+			var response = client.ClusterAllocationExplain();
+
+			var nodeAllocationDecisions = response.NodeAllocationDecisions;
+			nodeAllocationDecisions.Should().NotBeNullOrEmpty();
+			nodeAllocationDecisions.First().NodeDecision.Should().NotBeNull().And.Be(Decision.WorseBalance);
+		}
+	}
+}