Nest ElasticClient with multiple indexes to index a document - elasticsearch

Question

At first I had 1 index and my elasticclient was setup like below in my startup.cs
public static IServiceCollection AddElasticClient(this IServiceCollection services)
{
var elasticSettings = services.BuildServiceProvider().GetService<IOptions<ElasticSettings>>().Value;
var settings = new ConnectionSettings(new Uri(elasticSettings.Uri));
settings
.ThrowExceptions(elasticSettings.ThrowExceptions)
.PrettyJson(elasticSettings.PrettyJson)
.DefaultIndex(elasticSettings.Index)
.BasicAuthentication(elasticSettings.Username, elasticSettings.Password)
.DefaultMappingFor<CorrelationContext>(ms => ms.Ignore(p => p.DgpHeader));
var client = new ElasticClient(settings);
services.AddSingleton<IElasticClient>(client);
return services;
}
My writer looks like
public class ElasticWriter : IElasticWriter
{
private readonly IElasticClient _elasticClient;
public ElasticWriter(IElasticClient elasticClient)
{
_elasticClient = elasticClient ?? throw new ArgumentNullException(nameof(elasticClient));
}
public void Write(AuditElasticDoc doc)
{
var indexResponse = _elasticClient.IndexDocument(doc);
if (!indexResponse.IsValid)
{
throw indexResponse.OriginalException ?? new Exception("Invalid Elastic response when writing document.");
}
}
}
Now there is a new requirement by which they can provide the name of the index to write to.
All authentication data of the different indexes are provided through config settings, so I have everything available at startup.
The document type is always the same.
I found examples of specifying the index when querying but not when indexing.
Can I provide multiple indexes in my ElasticClient and specify the index when executing the IndexDocument?
Or do I need a separate client for each index?
If the latter, is there a way I can still use DI to inject the client in my writer or do I have to create one there at the spot?
Thx.
I'm using Nest 7.6.1

Answer 1

Instead of using IndexDocument, you can use IndexAsync method which will allow you to control additional request parameters
var indexResponse = await _elasticClient.IndexAsync(doc, descriptor => descriptor.Index("other"));
IndexDocument is a wrapper method, hiding the complexity of indexing documents from the clients. Have a look.
Request auth configuration
var indexResponse = await _elasticClient.IndexAsync(doc,
descriptor => descriptor
.Index("other")
.RequestConfiguration(rq => rq.BasicAuthentication("user", "pass")));