Split all the BulkAll and ScrollAll related tests into their own files and classes making it easier to read what they are doing (#3390)

Author: Mpdreamz

src/Tests/Tests/Document/Multiple/BulkAll/BulkAllApiTests.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Elastic.Xunit.XunitPlumbing;
+using FluentAssertions;
+using Nest;
+using Tests.Core.Extensions;
+using Tests.Core.ManagedElasticsearch.Clusters;
+using Tests.Framework.Integration;
+using Xunit;
+
+namespace Tests.Document.Multiple.BulkAll
+{
+	public abstract class BulkAllApiTestsBase : IClusterFixture<IntrusiveOperationCluster>, IClassFixture<EndpointUsage>
+	{
+		protected BulkAllApiTestsBase(IntrusiveOperationCluster cluster, EndpointUsage usage) => this.Client = cluster.Client;
+
+		protected class SmallObject
+		{
+			public int Id { get; set; }
+		}
+
+		protected IElasticClient Client { get; }
+
+		protected static string CreateIndexName() => $"project-copy-{Guid.NewGuid().ToString("N").Substring(8)}";
+
+		protected IEnumerable<SmallObject> CreateLazyStreamOfDocuments(int count)
+		{
+			for (var i = 0; i < count; i++)
+				yield return new SmallObject() { Id = i };
+		}
+
+		protected async Task CreateIndexAsync(string indexName, int numberOfShards)
+		{
+			var result = await this.Client.CreateIndexAsync(indexName, s => s
+				.Settings(settings => settings
+					.NumberOfShards(numberOfShards)
+					.NumberOfReplicas(0)
+				)
+			);
+			result.Should().NotBeNull();
+			result.ShouldBeValid();
+		}
+		protected static void OnError(ref Exception ex, Exception e, EventWaitHandle handle)
+		{
+			ex = e;
+			handle.Set();
+			throw e;
+		}
+	}
+}