Hi @gaetano,
Thanks for reaching out!
In this issue you mentioned you are configuring a Logtash too, I'm not sure if that's related.
Could you depict how your architecture is?
Something like this: (I created it using https://excalidraw.com/)
I'm assuming that in your case the apm server output that you have configured is not Elasticsearch and you are using Logtash instead in order to perform certain things before sending data to Elasticsearch.
Is the fix solved if you change the APM server output to Elasticsearch? (you would need to generate events again btw)
Thanks,
Alberto