foreach put pipeline processors is no longer an array as per elastic/elasticsearch#19402

Author: Mpdreamz

src/Nest/Ingest/Processors/ForeachProcessor.cs

@@ -15,15 +15,15 @@ public interface IForeachProcessor : IProcessor
 		[JsonProperty("field")]
 		Field Field { get; set; }
 
-		[JsonProperty("processors")]
-		IEnumerable<IProcessor> Processors { get; set; }
+		[JsonProperty("processor")]
+		IProcessor Processor { get; set; }
 	}
 
 	public class ForeachProcessor : ProcessorBase, IForeachProcessor
 	{
 		protected override string Name => "foreach";
 		public Field Field { get; set; }
-		public IEnumerable<IProcessor> Processors { get; set; }
+		public IProcessor Processor { get; set; }
 	}
 
 	public class ForeachProcessorDescriptor<T>
@@ -34,14 +34,14 @@ public class ForeachProcessorDescriptor<T>
 
 		Field IForeachProcessor.Field { get; set; }
 
-		IEnumerable<IProcessor> IForeachProcessor.Processors { get; set; }
+		IProcessor IForeachProcessor.Processor { get; set; }
 
 		public ForeachProcessorDescriptor<T> Field(Field field) => Assign(a => a.Field = field);
 
 		public ForeachProcessorDescriptor<T> Field(Expression<Func<T, object>> objectPath) =>
 			Assign(a => a.Field = objectPath);
 
-		public ForeachProcessorDescriptor<T> Processors(Func<ProcessorsDescriptor, IPromise<IList<IProcessor>>> selector) =>
-			Assign(a => a.Processors = selector?.Invoke(new ProcessorsDescriptor())?.Value);
+		public ForeachProcessorDescriptor<T> Processor(Func<ProcessorsDescriptor, IPromise<IList<IProcessor>>> selector) =>
+			Assign(a => a.Processor = selector?.Invoke(new ProcessorsDescriptor())?.Value?.FirstOrDefault());
 	}
 }

src/Tests/Ingest/PutPipeline/PutPipelineApiTests.cs

@@ -73,14 +73,11 @@ protected override LazyResponses ClientUsage() => Calls(
 					@foreach = new
 					{
 						field = "tags",
-						processors = new object[]
+						processors = new
 						{
-							new
+							uppercase = new
 							{
-								uppercase = new
-								{
-									field = "_value.name"
-								}
+								field = "_value.name"
 							}
 						}
 					}
@@ -195,7 +192,7 @@ protected override LazyResponses ClientUsage() => Calls(
 				)
 				.Foreach<Project>(fe => fe
 					.Field(p => p.Tags)
-					.Processors(pps => pps
+					.Processor(pps => pps
 						.Uppercase<Tag>(uc => uc
 							.Field("_value.name")
 						)
@@ -274,12 +271,9 @@ protected override LazyResponses ClientUsage() => Calls(
 				new ForeachProcessor
 				{
 					Field = Infer.Field<Project>(p => p.Tags),
-					Processors = new IProcessor[]
+					Processor = new UppercaseProcessor
 					{
-						new UppercaseProcessor
-						{
-							Field = "_value.name"
-						}
+						Field = "_value.name"
 					}
 				},
 				new GrokProcessor