Add x-pack features to XPackUsage and XPackInfo responses (#4065)

Relates: #4001
This commit adds features to XPackUsage and XPackInfo responses

(cherry picked from commit 564cfae)

Author: russcam

src/Nest/XPack/Info/XPackInfo/XPackInfoResponse.cs

@@ -47,6 +47,12 @@ public class XPackFeatures
 		[DataMember(Name = "ccr")]
 		public XPackFeature Ccr { get; internal set; }
 
+		[DataMember(Name = "data_frame")]
+		public XPackFeature DataFrame { get; internal set; }
+
+		[DataMember(Name = "flattened")]
+		public XPackFeature Flattened { get; internal set; }
+
 		[DataMember(Name = "graph")]
 		public XPackFeature Graph { get; internal set; }
 
@@ -71,6 +77,9 @@ public class XPackFeatures
 		[DataMember(Name = "sql")]
 		public XPackFeature Sql { get; internal set; }
 
+		[DataMember(Name = "vectors")]
+		public XPackFeature Vectors { get; internal set; }
+
 		[DataMember(Name = "watcher")]
 		public XPackFeature Watcher { get; internal set; }
 	}

src/Nest/XPack/Info/XPackUsage/XPackUsageResponse.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Runtime.Serialization;
 using Elasticsearch.Net;
 
@@ -44,6 +45,15 @@ public class XPackUsageResponse : ResponseBase
 		[DataMember(Name = "rollup")]
 		public XPackUsage Rollup { get; internal set; }
 
+		[DataMember(Name = "data_frame")]
+		public XPackUsage DataFrame { get; internal set; }
+
+		[DataMember(Name = "flattened")]
+		public XPackUsage Flattened { get; internal set; }
+
+		[DataMember(Name = "ilm")]
+		public IlmUsage IndexLifecycleManagement { get; internal set; }
+
 		[DataMember(Name = "ccr")]
 		public CcrUsage Ccr { get; internal set; }
 		[DataMember(Name = "watcher")]
@@ -64,6 +74,9 @@ public class XPackUsageResponse : ResponseBase
 		[DataMember(Name = "security")]
 		public SecurityUsage Security { get; internal set; }
 
+		[DataMember(Name = "vectors")]
+		public XPackUsage Vectors { get; internal set; }
+
 		[DataMember(Name = "voting_only")]
 		public XPackUsage VotingOnly { get; internal set; }
 	}
@@ -310,4 +323,23 @@ public class ForecastStatistics
 			public long Total { get; internal set; }
 		}
 	}
+
+	public class IlmUsage
+	{
+		[DataMember(Name = "policy_count")]
+		public int PolicyCount { get; internal set; }
+
+		[DataMember(Name = "policy_stats")]
+		public IReadOnlyCollection<IlmPolicyStatistics> PolicyStatistics { get; internal set; } =
+			EmptyReadOnly<IlmPolicyStatistics>.Collection;
+
+		public class IlmPolicyStatistics
+		{
+			[DataMember(Name = "phases")]
+			public IPhases Phases { get; internal set; }
+
+			[DataMember(Name = "indices_managed")]
+			public int IndicesManaged { get; internal set; }
+		}
+	}
 }

src/Tests/Tests/XPack/Info/XPackInfoApiTests.cs

@@ -1,3 +1,4 @@
+using System.Net;
 using System.Threading.Tasks;
 using Elastic.Xunit.XunitPlumbing;
 using FluentAssertions;
@@ -59,6 +60,13 @@ [I] public async Task XPackInfoResponse() => await Assert<XPackInfoResponse>(XPa
 			r.Features.Sql.Should().NotBeNull();
 			r.Features.Watcher.Should().NotBeNull();
 			r.License.Should().NotBeNull();
+
+			if (TestConfiguration.Instance.InRange(">=7.3.0"))
+			{
+				r.Features.Flattened.Should().NotBeNull();
+				r.Features.DataFrame.Should().NotBeNull();
+				r.Features.Vectors.Should().NotBeNull();
+			}
 		});
 
 		[I] public async Task XPackUsageResponse() => await Assert<XPackUsageResponse>(XPackUsageStep, (v, r) =>
@@ -88,7 +96,12 @@ [I] public async Task XPackUsageResponse() => await Assert<XPackUsageResponse>(X
 			r.Alerting.Watch.Should().NotBeNull();
 
 			if (TestConfiguration.Instance.InRange(">=7.3.0"))
-				r.VotingOnly.Should().NotBeNull();
+			{
+				r.Flattened.Should().NotBeNull();
+				r.DataFrame.Should().NotBeNull();
+				r.Vectors.Should().NotBeNull();
+        r.VotingOnly.Should().NotBeNull();
+			}
 		});
 	}
 }