---
title: Elastic.Serilog.Sinks
description: A Serilog sink that writes logs directly to Elasticsearch or Elastic Cloud Add a reference to the Elastic.Serilog.Sinks package: There’s a few ways that...
url: https://www.elastic.co/docs/reference/ecs/logging/dotnet/serilog-data-shipper
products:
  - ECS Logging
  - ECS Logging .NET
applies_to:
  - Elastic Cloud Serverless: Generally available
  - Elastic Stack: Generally available
---

# Elastic.Serilog.Sinks
A [Serilog](https://serilog.net/) sink that writes logs directly to [Elasticsearch](https://www.elastic.co/elasticsearch/) or [Elastic Cloud](https://www.elastic.co/cloud)

## Installation

Add a reference to the `Elastic.Serilog.Sinks` package:
```xml
<PackageReference Include="Elastic.Serilog.Sinks" Version="8.6.0" />
```


## Usage

There’s a few ways that you can extend a `Serilog` `LoggerConfiguration`:
```csharp
Log.Logger = new LoggerConfiguration()
	.MinimumLevel.Debug()
	.Enrich.FromLogContext()
```

**NOTE:** Don’t forget we also publish an [`Elastic.Apm.SerilogEnricher`](https://github.com/elastic/ecs-dotnet/blob/main/src/Elastic.Apm.SerilogEnricher/readme.md) for the Elastic APM Agent!
Writing to `Elasticsearch`
```csharp
.WriteTo.Elasticsearch(new [] { new Uri("http://localhost:9200" )}, opts =>
{
	opts.DataStream = new DataStreamName("logs", "console-example", "demo");
	opts.BootstrapMethod = BootstrapMethod.Failure;
	opts.ConfigureChannel = channelOpts =>
	{
		channelOpts.BufferOptions = new BufferOptions
		{
			ConcurrentConsumers = 10
		};
	};
}, transport =>
{
	// transport.Authentication(new BasicAuthentication(username, password));
	// transport.Authentication(new ApiKey(base64EncodedApiKey));
})
```

Writing to `Elastic Cloud`:
```csharp
.WriteTo.ElasticCloud("cloudId", "cloudUser", "cloudPass", opts =>
```

`opts` is an instance of `ElasticsearchSinkOptions` with the following options

## Configuration


| Option             | Description                                                                                                                                                                                                                                                                                            |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `Transport`        | An instance of `Elastic.Transport` that dictates where and how we are communicating to. Defaults to `http://localhost:9200`                                                                                                                                                                            |
| `DataStream`       | Where to write data, defaults to the `logs-dotnet-default` datastream.                                                                                                                                                                                                                                 |
| `BootstrapMethod`  | Wheter the sink should attempt to install component and index templates to ensure the datastream has ECS mappings. Can be be either `None` (the default), `Silent` (attempt but fail silently), `Failure` (attempt and fail with exceptions if bootstrapping fails).                                   |
| `TextFormatting`   | Allows explicit control of over the `EcsTextFormatterConfiguration` used to emit ECS json documents. See [`Elastic.CommonSchema.Serilog`](https://github.com/elastic/ecs-dotnet/tree/main/src/Elastic.CommonSchema.Serilog) for available options.                                                     |
| `ConfigureChannel` | A callback receiving the `DatastreamChannelOptions` which allows you to control sizing, backpressure etc. See [`Elastic.Ingest.Elasticsearch`](https://github.com/elastic/elastic-ingest-dotnet/blob/main/src/Elastic.Ingest.Elasticsearch/README.md#elasticingestelasticsearch) for more information. |

Note that you can also pass `ElasticsearchSinkOptions` directly
```csharp
.WriteTo.Elasticsearch(new ElasticsearchSinkOptions(client.Transport))
```

This allows you to reuse the `Transport` used by the Elasticsearch Client for instance.

## Authentication

When Elasticsearch security features are enabled, requests without a valid authentication header will be rejected. You can enable authentication via one of the methods below:
**Basic Auth**
```csharp
.WriteTo.Elasticsearch(new [] { new Uri("http://localhost:9200" )}, opts =>
{
	...
}, transport =>
{
	transport.Authentication(new BasicAuthentication(username, password)); 
})
```

**API Key**
```csharp
.WriteTo.Elasticsearch(new [] { new Uri("http://localhost:9200" )}, opts =>
{
	...
}, transport =>
{
	transport.Authentication(new ApiKey(base64EncodedApiKey)); 
})
```

To learn more about authentication with the Elastic Stack, see [User Authentication](https://www.elastic.co/docs/deploy-manage/users-roles/cluster-or-deployment-auth/user-authentication).

## ECS aware message templates

This sink by proxy of its formatter allows you to set ECS fields directly from the message template using properties that adhere to the [[https://messagetemplates.org/](https://messagetemplates.org/)](https://messagetemplates.org/) format.
The available ECS message template properties are listed under `LogTemplateProperties.*` e.g `LogTemplateProperties.TraceId`
```csharp
Log.Information("The time is {TraceId}", "my-trace-id");
```

Will override `trace.id` on the resulting ECS json document.

## Troubleshooting

In case of issues, you can enable the [Serilog Self-Log feature](https://github.com/serilog/serilog/wiki/Debugging-and-Diagnostics#selflog) to expose any error you might have encountered.

## Comparison with [`Serilog.Sinks.Elasticsearch`](https://github.com/serilog-contrib/serilog-sinks-elasticsearch)

- `Serilog.Sinks.Elasticsearch` is an amazing community led sink that has a ton of options and works against older Elasticsearch versions `< 8.0`.
- `Serilog.Sinks.Elasticsearch` is unofficially supported by Elastic with some of the .NET team helping to maintain it.
- `Elastic.Serilog.Sinks` is **officially** supported by Elastic and was purposely build to adhere to newer best practices around logging, datastreams and ILM.
- `Elastic.Serilog.Sinks` is purposely build to have fewer configuration options and be more prescriptive than `Serilog.Sinks.Elasticsearch`.
- That is not to say there aren’t plenty of configuration hooks in `Elastic.Serilog.Sinks`


### Notable absent features:

- `Elastic.Serilog.Sinks` only works with `Elasticsearch 8.x` and up.
- This is because the bootrapping (`BootstrapMethod`) attempts to load templates build for Elasticsearch 8.0 and up.
- `Elastic.Serilog.Sinks` has only one way it emits data to Elasticsearch confirming to the [ecs-logging specification](https://github.com/elastic/ecs-logging)
- That doesn’t mean you can not introduce your own additional properties though.
- `Elastic.Serilog.Sinks` has no durable mode.
- If you need higher guarantees on log delivery use [`Serilog.Sinks.File`](https://github.com/serilog/serilog-sinks-file) with our [ECS log formatter](https://www.nuget.org/packages/Elastic.CommonSchema.Serilog/) for Serilog and use [filebeat](https://www.elastic.co/beats/filebeat) to ship these logs.
- Check out [Elastic Agent and Fleet](https://www.elastic.co/docs/reference/fleet) to simplify collecting logs and metrics on the edge.

If you miss a particular feature from `Serilog.Sinks.Elasticsearch` in `Elastic.Serilog.Sinks` please open a [feature request](https://github.com/elastic/ecs-dotnet/issues/new?assignees=&labels=enhancement&template=feature_request.md&title=%5BFEATURE%5D)! We’d love to grow this sink organically moving forward.