Getting correct service map when using SetService

Elastic Observability APM
1

The method SetService is used to signal an external call to another service as in code below.

However, although the transactions nicely wrap in the calling service, the service map in Elastic 8.14.0 does not display the external service as visible in picture.

Is there some way to make the external service becoming visible in the service map?

Transactions

Both services are identified nicely:

image
image822×482 34.1 KB

The master and external transaction are both visible:

image
image996×608 28.8 KB

On the external service, the transaction is also visible:

image
image1180×1008 89.1 KB

Service Map

image
image1070×736 57.2 KB

Code

            Configure();

            CancellationToken cancellationToken = CancellationToken.None;

            ITransaction? transaction = Elastic.Apm.Agent.Tracer.StartTransaction("Master Txn", ApiConstants.TypeUnknown, null);

            //
            // External transaction.
            //
            try
            {
                var dist = Elastic.Apm.Agent.Tracer.CurrentSpan?.OutgoingDistributedTracingData ?? transaction?.OutgoingDistributedTracingData;

                ITransaction? externalTransaction = Elastic.Apm.Agent.Tracer.StartTransaction("External Action", ApiConstants.TypeUnknown, dist);

                externalTransaction?.SetService("External System Called", "DEFAULT");

                try
                {
                    Thread.Sleep(2000);
                }
                finally
                {
                    externalTransaction?.End();
                }
            }
            finally
            {
                transaction?.End();
            }

            //
            // Time to send to Elastic server.
            //
            Thread.Sleep(5000);