Continuation of #1206: exposing constructors of bucket aggregation types for better testability

Author: gmarz

src/Nest/Domain/Aggregations/Bucket.cs

@@ -5,6 +5,9 @@ namespace Nest
 	public class Bucket<TBucketItem> : BucketAggregationBase
 		where TBucketItem : IBucketItem
 	{
+		public Bucket() { }
+		public Bucket(IDictionary<string, IAggregation> aggregations) : base(aggregations) { }
+
 		public IList<TBucketItem> Items { get; set; }
 	}
 	public class Bucket : IAggregation
@@ -17,6 +20,9 @@ public class Bucket : IAggregation
 	public class BucketWithDocCount<TBucketItem> : BucketAggregationBase, IBucketWithCountAggregation
 		where TBucketItem : IBucketItem
 	{
+		public BucketWithDocCount() { }
+		public BucketWithDocCount(IDictionary<string, IAggregation> aggregations) : base(aggregations) { }
+
 		public IList<TBucketItem> Items { get; set; }
 
 		public long DocCount { get; internal set; }

src/Nest/Domain/Aggregations/HistogramItem.cs

@@ -1,9 +1,13 @@
 using System;
+using System.Collections.Generic;
 
 namespace Nest
 {
 	public class HistogramItem : BucketAggregationBase, IBucketItem
 	{
+		public HistogramItem() { }
+		public HistogramItem(IDictionary<string, IAggregation> aggregations) : base(aggregations) { }
+
 		public long Key { get; set; }
 		public string KeyAsString { get; set; }
 

src/Nest/Domain/Aggregations/KeyItem.cs

@@ -1,7 +1,12 @@
-namespace Nest
+using System.Collections.Generic;
+
+namespace Nest
 {
 	public class KeyItem : BucketAggregationBase, IBucketItem
 	{
+		public KeyItem() { }
+		public KeyItem(IDictionary<string, IAggregation> aggregations) : base(aggregations) { }
+
 		public string Key { get; set; }
 		public string KeyAsString { get; set; }
 		public long DocCount { get; set; }

src/Nest/Domain/Aggregations/RangeItem.cs

@@ -1,7 +1,12 @@
-namespace Nest
+using System.Collections.Generic;
+
+namespace Nest
 {
 	public class RangeItem : BucketAggregationBase, IBucketItem
 	{
+		public RangeItem() { }
+		public RangeItem(IDictionary<string, IAggregation> aggregations) : base(aggregations) { }
+
 		public string Key { get; set; }
 		public double? From { get; set; }
 		public string FromAsString { get; set; }

src/Nest/Domain/Aggregations/SignificantTermItem.cs

@@ -1,7 +1,12 @@
-namespace Nest
+using System.Collections.Generic;
+
+namespace Nest
 {
 	public class SignificantTermItem : BucketAggregationBase, IBucketItem
 	{
+		public SignificantTermItem() { }
+		public SignificantTermItem(IDictionary<string, IAggregation> aggregations) : base(aggregations) { }
+
 		public string Key { get; set; }
 		public long BgCount { get; set; }
 		public long DocCount { get; set; }