Startup issues with elk stack docker container

[B45man]

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Does this issue relate to a new feature or an existing bug?

• [*] Bug

What version of Serilog.Sinks.Elasticsearch is affected? Please list the related NuGet package. Serilog.Sinks.Elasticsearch: 8.0.0 Serilog.Extensions.Logging: 3.0.1

What is the target framework and operating system? See [target frameworks] netCore 3.0 preview 8 (netcoreapp3.0 in the csproj file).

Please describe the current behavior?

• ASP.Net Core 3 project, running with a Docker Compose file inside a Linux container.
• Using Autofac
• Using the sebp/elk docker container for a full ELK stack. Elasticsearch is at version 7.3.0.

Inside an Autofac module, I am registering my Logging as follows:

var file = File.CreateText("serilog-errors.txt");
            Serilog.Debugging.SelfLog.Enable(file);

            Log.Logger = new LoggerConfiguration()
                 .WriteTo.File("test.txt")
                 .WriteTo.Elasticsearch(new ElasticsearchSinkOptions(new Uri("http://localhost:9200"))
                 {
                     AutoRegisterTemplate = true,
                     AutoRegisterTemplateVersion = AutoRegisterTemplateVersion.ESv7,
                     RegisterTemplateFailure = RegisterTemplateRecovery.FailSink
                 })
                 .CreateLogger();


            builder.Register(_ => new LoggerFactory(new ILoggerProvider[] { new SerilogLoggerProvider() }))
                .As<ILoggerFactory>()
                .SingleInstance();

            builder.RegisterGeneric(typeof(Logger<>))
                .As(typeof(ILogger<>))
                .SingleInstance();

This throws an exception with the message 'Cannot assign requested address. Call: Status code unknown from: HEAD /_template/serilog-events-template'.

Serilog-errors.txt is as follows:

 ---> System.Net.Http.HttpRequestException: Cannot assign requested address
 ---> System.Net.Sockets.SocketException (99): Cannot assign requested address
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at Elasticsearch.Net.HttpConnection.Request[TResponse](RequestData requestData)
   --- End of inner exception stack trace ---
   at Elasticsearch.Net.Transport`1.HandleElasticsearchClientException(RequestData data, Exception clientException, IElasticsearchResponse response)
   at Elasticsearch.Net.Transport`1.FinalizeResponse[TResponse](RequestData requestData, IRequestPipeline pipeline, List`1 seenExceptions, TResponse response)
   at Elasticsearch.Net.Transport`1.Request[TResponse](HttpMethod method, String path, PostData data, IRequestParameters requestParameters)
   at Elasticsearch.Net.ElasticLowLevelClient.DoRequest[TResponse](HttpMethod method, String path, PostData data, IRequestParameters requestParameters)
   at Elasticsearch.Net.NamespacedClientProxy.DoRequest[TResponse](HttpMethod post, String url, PostData body, IRequestParameters params)
   at Elasticsearch.Net.Specification.IndicesApi.LowLevelIndicesNamespace.TemplateExistsForAll[TResponse](String name, IndexTemplateExistsRequestParameters requestParameters)
   at Serilog.Sinks.Elasticsearch.ElasticsearchSinkState.RegisterTemplateIfNeeded()
2019-09-01T13:08:14.4241221Z Caught exception while preforming bulk operation to Elasticsearch: Elasticsearch.Net.ElasticsearchClientException: Cannot assign requested address. Call: Status code unknown from: POST /_bulk
 ---> System.Net.Http.HttpRequestException: Cannot assign requested address
 ---> System.Net.Sockets.SocketException (99): Cannot assign requested address
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at Elasticsearch.Net.HttpConnection.Request[TResponse](RequestData requestData)
   --- End of inner exception stack trace ---
   at Elasticsearch.Net.Transport`1.HandleElasticsearchClientException(RequestData data, Exception clientException, IElasticsearchResponse response)
   at Elasticsearch.Net.Transport`1.FinalizeResponse[TResponse](RequestData requestData, IRequestPipeline pipeline, List`1 seenExceptions, TResponse response)
   at Elasticsearch.Net.Transport`1.Request[TResponse](HttpMethod method, String path, PostData data, IRequestParameters requestParameters)
   at Elasticsearch.Net.ElasticLowLevelClient.DoRequest[TResponse](HttpMethod method, String path, PostData data, IRequestParameters requestParameters)
   at Elasticsearch.Net.ElasticLowLevelClient.Bulk[TResponse](PostData body, BulkRequestParameters requestParameters)
   at Serilog.Sinks.Elasticsearch.ElasticsearchSink.EmitBatchChecked[T](IEnumerable`1 events)
   at Serilog.Sinks.Elasticsearch.ElasticsearchSink.EmitBatch(IEnumerable`1 events)

Please describe the expected behavior? Serilog starts as normal and logs to Elasticsearch.