Filebeat : "Failed to connect to backoff"

Elastic Stack Beats
4

New developpement :

if I add protocol, - "5044:5044/tcp" to logstash, remove the elk-network and configure filebeat to publish to [<swarm ip>:5044]... it eventually works!
This also sound like I cannot connect through tcp on a container on the same docker network.... or not the way I expected!

docker-compose.yml

... 
 logstash:
    image: docker.elastic.co/logstash/logstash:6.4.2
    ports:
     - "12201:12201/udp"
     - "5044:5044/tcp"
     - "9600:9600"
...

logstash.conf

...
output.logstash:
  hosts: ["<swarm ip>:5044"]
  bulk_max_size: 4096
...
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