docker-log-centralizer/filebeat/filebeat.yml

output:
  logstash:
    enabled: true
    hosts:
      - shipper:5044
    timeout: 15
#    ssl:
#      certificate_authorities:
#      - /etc/pki/tls/certs/logstash-beats.crt

filebeat:
  prospectors:
    -
      paths:
        - "/var/log/nginx/*.log"
      document_type: nginx-access
    -
      paths:
        - "/var/log/random/*.log"
      document_type: random
    -
      paths:
        - "/var/log/apache/*.log"
      document_type: apache