added support for stored fields in InnerHits definition

Author: vitor-saraiva

src/Nest/Search/Search/InnerHits/GlobalInnerHit.cs

@@ -36,6 +36,7 @@ public class GlobalInnerHitDescriptor<T> : DescriptorBase<GlobalInnerHitDescript
 		ISourceFilter IInnerHits.Source { get; set; }
 		bool? IInnerHits.Version { get; set; }
 		IList<Field> IInnerHits.FielddataFields { get; set; }
+		IList<Field> IInnerHits.Fields { get; set; }
 		IScriptFields IInnerHits.ScriptFields { get; set; }
 
 		public GlobalInnerHitDescriptor<T> Query(Func<QueryContainerDescriptor<T>, QueryContainer> querySelector) =>
@@ -51,10 +52,16 @@ public GlobalInnerHitDescriptor<T> InnerHits(Func<NamedInnerHitsDescriptor<T>, I
 		public GlobalInnerHitDescriptor<T> Name(string name) => Assign(a => a.Name = name);
 
 		public GlobalInnerHitDescriptor<T> FielddataFields(params string[] fielddataFields) =>
-			Assign(a => a.FielddataFields = fielddataFields?.Select(f => (Field) f).ToListOrNullIfEmpty());
+			Assign(a => a.FielddataFields = fielddataFields?.Select(f => (Field)f).ToListOrNullIfEmpty());
 
 		public GlobalInnerHitDescriptor<T> FielddataFields(params Expression<Func<T, object>>[] fielddataFields) =>
-			Assign(a => a.FielddataFields = fielddataFields?.Select(f => (Field) f).ToListOrNullIfEmpty());
+			Assign(a => a.FielddataFields = fielddataFields?.Select(f => (Field)f).ToListOrNullIfEmpty());
+
+		public GlobalInnerHitDescriptor<T> Fields(params string[] fields) =>
+			Assign(a => a.Fields = fields?.Select(f => (Field)f).ToListOrNullIfEmpty());
+
+		public GlobalInnerHitDescriptor<T> Fields(params Expression<Func<T, object>>[] fields) =>
+			Assign(a => a.Fields = fields?.Select(f => (Field)f).ToListOrNullIfEmpty());
 
 		public GlobalInnerHitDescriptor<T> Explain(bool explain = true) => Assign(a => a.Explain = explain);
 
@@ -76,4 +83,4 @@ public GlobalInnerHitDescriptor<T> Source(Func<SourceFilterDescriptor<T>, ISourc
 		public GlobalInnerHitDescriptor<T> ScriptFields(Func<ScriptFieldsDescriptor, IPromise<IScriptFields>> selector) =>
 			Assign(a => a.ScriptFields = selector?.Invoke(new ScriptFieldsDescriptor())?.Value);
 	}
-}
+}

src/Nest/Search/Search/InnerHits/InnerHits.cs

@@ -36,6 +36,9 @@ public interface IInnerHits
 		[JsonProperty(PropertyName = "fielddata_fields")]
 		IList<Field> FielddataFields { get; set; }
 
+		[JsonProperty(PropertyName = "fields")]
+		IList<Field> Fields { get; set; }
+
 		[JsonProperty(PropertyName = "script_fields")]
 		IScriptFields ScriptFields { get; set; }
 	}
@@ -60,6 +63,8 @@ public class InnerHits : IInnerHits
 
 		public IList<Field> FielddataFields { get; set; }
 
+		public IList<Field> Fields { get; set; }
+
 		public IScriptFields ScriptFields { get; set; }
 	}
 
@@ -75,6 +80,7 @@ public class InnerHitsDescriptor<T> : DescriptorBase<InnerHitsDescriptor<T>, IIn
 		ISourceFilter IInnerHits.Source { get; set; }
 		bool? IInnerHits.Version { get; set; }
 		IList<Field> IInnerHits.FielddataFields { get; set; }
+		IList<Field> IInnerHits.Fields { get; set; }
 		IScriptFields IInnerHits.ScriptFields { get; set; }
 
 		public InnerHitsDescriptor<T> From(int? from) => Assign(a => a.From = from);
@@ -89,6 +95,12 @@ public InnerHitsDescriptor<T> FielddataFields(params string[] fielddataFields) =
 		public InnerHitsDescriptor<T> FielddataFields(params Expression<Func<T, object>>[] fielddataFields) =>
 			Assign(a => a.FielddataFields = fielddataFields?.Select(f => (Field)f).ToListOrNullIfEmpty());
 
+		public InnerHitsDescriptor<T> Fields(params string[] fields) =>
+			Assign(a => a.Fields = fields?.Select(f => (Field)f).ToListOrNullIfEmpty());
+
+		public InnerHitsDescriptor<T> Fields(params Expression<Func<T, object>>[] fields) =>
+			Assign(a => a.Fields = fields?.Select(f => (Field)f).ToListOrNullIfEmpty());
+
 		public InnerHitsDescriptor<T> Explain(bool? explain = true) => Assign(a => a.Explain = explain);
 
 		public InnerHitsDescriptor<T> Version(bool? version = true) => Assign(a => a.Version = version);
@@ -110,4 +122,4 @@ public InnerHitsDescriptor<T> Source(Func<SourceFilterDescriptor<T>, ISourceFilt
 		public InnerHitsDescriptor<T> ScriptFields(Func<ScriptFieldsDescriptor, IPromise<IScriptFields>> selector) =>
 			Assign(a => a.ScriptFields = selector?.Invoke(new ScriptFieldsDescriptor())?.Value);
 	}
-}
+}