cf. https://elk-docker.readthedocs.io/
DEMO: https://demo.elastic.co/app/discover#/
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Cf.https://discuss.elastic.co/t/filebeat-changing-filebeats-path-for-its-configuration-module/236243

########### /etc/elasticsearch/elasticsearch.yml
node.name: elk
path.repo: /var/backups
network.host: 172.17.0.2
http.port: 9200
cluster.initial_master_nodes: ["elk"]
xpack.security.enabled: false

xpack.security.http.ssl.enabled: false
#xpack.security.http.ssl.keystore.path: /etc/elasticsearch/certificates/my-keystore.p12
#xpack.security.http.ssl.keystore.password: xxx

xpack.security.transport.ssl.enabled: false
#xpack.security.transport.ssl.keystore.password: xxx
#xpack.security.transport.ssl.keystore.path: /etc/elasticsearch/certificates/my-keystore.p12


cluster.routing.allocation.disk.watermark.low: 85%
cluster.routing.allocation.disk.watermark.high: 95%

########### /opt/kibana/config/kibana.yml
elasticsearch.hosts: ['http://172.17.0.2:9200']                                                                                                                                     
server.host: "172.17.0.2"                                                                                                                                                           
server.port: 5601                                                                                                                                                                   
#server.ssl.certificate: /etc/elasticsearch/certificates/my-certificate.pem                                                                                                         
#server.ssl.enabled: true                                                                                                                                                           
#server.ssl.key: /etc/elasticsearch/certificates/my-private-key.pem                                                                                                                 
server.publicBaseUrl: http://172.17.0.2:5601