removed PreOffset and PostOffset and introduced Offset (#2845)

Reintroduced removed members for backwards compatibility

Author: Mpdreamz

src/Nest/Aggregations/Bucket/Histogram/HistogramAggregation.cs

@@ -26,12 +26,15 @@ public interface IHistogramAggregation : IBucketAggregation
 		[JsonProperty("extended_bounds")]
 		ExtendedBounds<double> ExtendedBounds { get; set; }
 
-		[JsonProperty("pre_offset")]
+		[Obsolete("Removed in Elasticsearch 2.0. Will be removed in the next major version of NEST")]
 		long? PreOffset { get; set; }
 
-		[JsonProperty("post_offset")]
+		[Obsolete("Removed in Elasticsearch 2.0. Will be removed in the next major version of NEST")]
 		long? PostOffset { get; set; }
 
+		[JsonProperty("offset")]
+		double? Offset { get; set; }
+
 		[JsonProperty("missing")]
 		double? Missing { get; set; }
 	}
@@ -46,6 +49,7 @@ public class HistogramAggregation : BucketAggregationBase, IHistogramAggregation
 		public ExtendedBounds<double> ExtendedBounds { get; set; }
 		public long? PreOffset { get; set; }
 		public long? PostOffset { get; set; }
+		public double? Offset { get; set; }
 		public double? Missing { get; set; }
 
 		internal HistogramAggregation() { }
@@ -72,8 +76,10 @@ public class HistogramAggregationDescriptor<T>
 		ExtendedBounds<double> IHistogramAggregation.ExtendedBounds { get; set; }
 
 		long? IHistogramAggregation.PreOffset { get; set; }
-
+		
 		long? IHistogramAggregation.PostOffset { get; set; }
+		
+		double? IHistogramAggregation.Offset { get; set; }
 
 		double? IHistogramAggregation.Missing { get; set; }
 
@@ -102,9 +108,13 @@ public HistogramAggregationDescriptor<T> OrderDescending(string key) =>
 		public HistogramAggregationDescriptor<T> ExtendedBounds(double min, double max) =>
 			Assign(a => a.ExtendedBounds = new ExtendedBounds<double> { Minimum = min, Maximum = max });
 
-		public HistogramAggregationDescriptor<T> PreOffset(long preOffset) => Assign(a => a.PreOffset = preOffset);
+		[Obsolete("Removed in Elasticsearch 2.0. Will be removed in the next major version of NEST")]
+		public HistogramAggregationDescriptor<T> PreOffset(long preOffset) => this;
 
-		public HistogramAggregationDescriptor<T> PostOffset(long postOffset) => Assign(a => a.PostOffset = postOffset);
+		[Obsolete("Removed in Elasticsearch 2.0. Will be removed in the next major version of NEST")]
+		public HistogramAggregationDescriptor<T> PostOffset(long postOffset) => this;
+		
+		public HistogramAggregationDescriptor<T> Offset(double offset) => Assign(a => a.Offset = offset);
 
 		public HistogramAggregationDescriptor<T> Missing(double missing) => Assign(a => a.Missing = missing);
 	}

src/Tests/Aggregations/Bucket/Histogram/HistogramAggregationUsageTests.cs

@@ -27,7 +27,8 @@ public HistogramAggregationUsageTests(ReadOnlyCluster i, EndpointUsage usage) :
 						order = new
 						{
 							_key = "desc"
-						}
+						},
+						offset = 1.1
 					}
 				}
 			}
@@ -40,6 +41,7 @@ public HistogramAggregationUsageTests(ReadOnlyCluster i, EndpointUsage usage) :
 					.Interval(100)
 					.Missing(0)
 					.Order(HistogramOrder.KeyDescending)
+					.Offset(1.1)
 				)
 			);
 
@@ -51,7 +53,8 @@ public HistogramAggregationUsageTests(ReadOnlyCluster i, EndpointUsage usage) :
 					Field = Field<Project>(p => p.NumberOfCommits),
 					Interval = 100,
 					Missing = 0,
-					Order = HistogramOrder.KeyDescending
+					Order = HistogramOrder.KeyDescending,
+					Offset = 1.1
 				}
 			};