Revert AnalyzeRequest body properties to deprecated names

char_filters and filters are deprecated in 2.4.0+ and it is recommended to use char_filter and filter. However, NEST 2.x needs to support all Elasticsearch 2.x versions, which throw an exception with the new names. Therefore use the deprecated names in the body of an analyze request

Author: russcam

src/Nest/Indices/Analyze/AnalyzeRequest.cs

@@ -15,14 +15,15 @@ public partial interface IAnalyzeRequest
 
 		///<summary>A collection of character filters to use for the analysis</summary>
 		[Obsolete("Deprecated in 2.4.0. Will be removed in 5.0. Use CharFilter instead")]
+		[JsonIgnore]
 		string[] CharFilters { get; set; }
 
 		///<summary>A collection of character filters to use for the analysis</summary>
-		[JsonProperty("char_filter")]
+		[JsonProperty("char_filters")]
 		string[] CharFilter { get; set; }
 
 		///<summary>A collection of filters to use for the analysis</summary>
-		[JsonProperty("filter")]
+		[JsonProperty("filters")]
 		string[] Filter { get; set; }
 
 		///<summary>Use the analyzer configured for this field (instead of passing the analyzer name)</summary>
@@ -31,6 +32,7 @@ public partial interface IAnalyzeRequest
 
 		///<summary>A collection of filters to use for the analysis</summary>
 		[Obsolete("Deprecated in 2.4.0. Will be removed in 5.0. Use Filter instead")]
+		[JsonIgnore]
 		string[] Filters { get; set; }
 
 		///<summary>The text on which the analysis should be performed (when request body is not used)</summary>