Output Stream to ELK

Hello there,

I would like to test the output Stream.
I just created a working ELK stack on docker.
I created on Graylog Output Stream to TCP port 5000 (for my logstash port)
I attrib the output to the Stream I want duplicate, but when I log, The data are sent to Graylog sucessfull, but nothing under ELK.

I tryed direct access from nxlog to tcp port 5000, and receive right informations.

It there a way for I send log > Write them on Graylog > Output to Logstash > Write to ES and Kibana ?

Did I miss something ?