Intorduce EndOffset to Analyze token

Deprecate misspelt EndPostion

Author: russcam

src/Nest/Indices/Analyze/AnalyzeToken.cs

@@ -1,28 +1,31 @@
-using Newtonsoft.Json;
+using System;
+using Newtonsoft.Json;
 
 namespace Nest
 {
 	[JsonObject]
 	public class AnalyzeToken
 	{
-		[JsonProperty(PropertyName = "token")]
+		[JsonProperty("token")]
 		public string Token { get; internal set; }
 
-		[JsonProperty(PropertyName = "type")]
+		[JsonProperty("type")]
 		public string Type { get; internal set; }
 
 		//TODO change to long in 6.0
-		[JsonProperty(PropertyName = "start_offset")]
+		[JsonProperty("start_offset")]
 		public int StartOffset { get; internal set; }
 
-		[JsonProperty(PropertyName = "end_offset")]
-		public int EndPostion { get; internal set; }
+        [Obsolete("Use EndOffset")]
+	    public int EndPostion => EndOffset;
 
-		[JsonProperty(PropertyName = "position")]
+		[JsonProperty("end_offset")]
+		public int EndOffset { get; internal set; }
+
+		[JsonProperty("position")]
 		public int Position { get; internal set; }
 
-		[JsonProperty(PropertyName = "position_length")]
+		[JsonProperty("position_length")]
 		public long? PositionLength { get; internal set; }
-
 	}
 }