Align thread pool info to thread pool configuration (#3847)

Relates: elastic/elasticsearch#29123

Author: russcam

src/Nest/Cat/CatThreadPool/CatThreadPoolRecord.cs

@@ -10,8 +10,8 @@ public class CatThreadPoolRecord : ICatRecord
 		/// The number of active threads in the current thread pool
 		/// </summary>
 		[DataMember(Name = "active")]
-		[JsonFormatter(typeof(StringLongFormatter))]
-		public long Active { get; set; }
+		[JsonFormatter(typeof(StringIntFormatter))]
+		public int Active { get; set; }
 
 		/// <summary>
 		/// The number of tasks completed by the thread pool executor
@@ -108,8 +108,8 @@ public class CatThreadPoolRecord : ICatRecord
 		/// The number of tasks in the queue for the current thread pool
 		/// </summary>
 		[DataMember(Name = "queue")]
-		[JsonFormatter(typeof(StringLongFormatter))]
-		public long Queue { get; set; }
+		[JsonFormatter(typeof(StringIntFormatter))]
+		public int Queue { get; set; }
 
 		/// <summary>
 		/// The maximum number of tasks permitted in the queue for the current thread pool

src/Nest/Cluster/NodesInfo/NodeInfo.cs

@@ -222,18 +222,39 @@ public class NodeInfoJvmMemory
 	[DataContract]
 	public class NodeThreadPoolInfo
 	{
+		/// <summary>
+		/// The configured keep alive time for threads
+		/// </summary>
 		[DataMember(Name = "keep_alive")]
 		public string KeepAlive { get; internal set; }
 
+		/// <summary>
+		/// The configured maximum number of active threads allowed in the current thread pool
+		/// </summary>
 		[DataMember(Name = "max")]
 		public int? Max { get; internal set; }
 
-		[DataMember(Name = "min")]
-		public int? Min { get; internal set; }
+		/// <summary>
+		/// The configured core number of active threads allowed in the current thread pool
+		/// </summary>
+		[DataMember(Name = "core")]
+		public int? Core { get; internal set; }
 
+		/// <summary>
+		/// The configured fixed number of active threads allowed in the current thread pool
+		/// </summary>
+		[DataMember(Name = "size")]
+		public int? Size { get; internal set; }
+
+		/// <summary>
+		/// The maximum number of tasks permitted in the queue for the current thread pool
+		/// </summary>
 		[DataMember(Name = "queue_size")]
 		public int? QueueSize { get; internal set; }
 
+		/// <summary>
+		/// The type of thread pool
+		/// </summary>
 		[DataMember(Name = "type")]
 		public string Type { get; internal set; }
 	}

src/Tests/Tests/Cluster/NodesInfo/NodesInfoApiTests.cs

@@ -118,6 +118,10 @@ protected void Assert(IReadOnlyDictionary<string, NodeThreadPoolInfo> pools)
 			pool.KeepAlive.Should().NotBeNullOrWhiteSpace();
 			pool.Type.Should().Be("scaling");
 			pool.QueueSize.Should().BeGreaterOrEqualTo(-1);
+
+			// both should have a value for a scaling pool
+			pool.Core.Should().HaveValue();
+			pool.Max.Should().HaveValue();
 		}
 
 		protected void Assert(NodeInfoTransport transport)