BulkAll requires DefaultIndex or DefaultMappingFor with index

From: https://discuss.elastic.co/t/nest-client-bulkall-requires-defaultindexfor-or-defaultindex-to-work/189766

The BulkAll method of ElasticClient requires

• DefaultMappingFor<T>() with Index

or

• DefaultIndex()

or

• .Index() on the BulkAll call

to work.

You’ll get an ArgumentException otherwise :

Index name is null for the given type and no default index is set. Map an index name using ConnectionSettings.DefaultMappingFor<TDocument>() or set a default index using ConnectionSettings.DefaultIndex()

Repro

static void Main(string[] args)
{
	var connectionSettings = new ConnectionSettings(new Uri("http://localhost:9200"))
	.DisableDirectStreaming()
	.PrettyJson()
	.OnRequestCompleted(callDetails =>
	{
		if (callDetails.RequestBodyInBytes != null)
		{
			Console.WriteLine(
				$"{callDetails.HttpMethod} {callDetails.Uri} \n" +
				$"{Encoding.UTF8.GetString(callDetails.RequestBodyInBytes)}");
		}
		else
		{
			Console.WriteLine($"{callDetails.HttpMethod} {callDetails.Uri}");
		}

		Console.WriteLine();

		if (callDetails.ResponseBodyInBytes != null)
		{
			Console.WriteLine($"Status: {callDetails.HttpStatusCode}\n" +
					 $"{Encoding.UTF8.GetString(callDetails.ResponseBodyInBytes)}\n" +
					 $"{new string('-', 30)}\n");
		}
		else
		{
			Console.WriteLine($"Status: {callDetails.HttpStatusCode}\n" +
					 $"{new string('-', 30)}\n");
		}
	});
	//uncomment one of the following lines to crash
	//connectionSettings.DefaultMappingFor<Document>(d => d.IndexName("myindex"));
	//connectionSettings.DefaultIndex("mydefaultindex");

	ElasticClient client = new ElasticClient(connectionSettings);

	BulkAllObservable<Document> bulk = client.BulkAll(GetDocuments(), b => b
		.BufferToBulk((descriptor, list) =>
		{
			foreach (Document doc in list)
			{
				descriptor.Index<Document>(bi => bi
					.Index($"myindex-{doc.Date:yyyy.mm.dd}")
					.Document(doc)
				);
			}
		})
		.Size(2)
	);

	bulk.Subscribe(new BulkAllObserver(
		onNext: r => Console.WriteLine(string.Join(";", r.Items.Select(i => i.Id))),
		onError: e => Console.Error.WriteLine(e),
		onCompleted: () => Console.WriteLine("Done")
	));
	bulk.Wait(TimeSpan.FromSeconds(30), null);
}

private static IEnumerable<Document> GetDocuments()
{
	for (int i = 0; i < 10; i++)
	{
		yield return new Document { Date = DateTime.UtcNow.AddDays(i) };
	}
}

private class Document
{
	public DateTime Date { get; set; }
}

[russcam]

I’ve added https://github.com/elastic/elasticsearch-net/pull/4017 to include additonal details in the XML docs

[russcam]

I’m ++ in keeping as is. and improving the documentation. I’ll add something now