Thank you Steffen.
I just updated to filebeat 5.0.2 (and Elasticsearch 5.0.2, Logstash 5.0.2, and Kibana 5.0.2)
And on elasticsearch no filebeat-%{+yyyy.MM.dd.HH} index is created
Looking at filebeat.log, I see now these errors :
2016-12-07T17:38:04+01:00 ERR Failed to publish events caused by: EOF
2016-12-07T17:38:24+01:00 ERR Failed to publish events caused by: EOF
2016-12-07T17:38:54+01:00 ERR Failed to publish events caused by: EOF
Here is an extract of my filebeat.yml :
logstash:
hosts: ["elk-docker:5044"]
index: 'filebeat-%{+yyyy.MM.dd.HH}'
ssl:
certificate_authorities: ["/etc/pki/tls/certs/logstash-beats.crt"]
Laurent