filebeat.yml:
      prospectors:
        # Mounted `filebeat-prospectors` configmap:
        path: ${path.config}/prospectors.d/*.yml
        # Reload prospectors configs as they change:
        reload.enabled: false
      modules:
        path: ${path.config}/modules.d/*.yml
        # Reload module configs as they change:
        reload.enabled: false

    json.keys_under_root: true
    fields_under_root: true
    processors:
      - add_cloud_metadata:

    output.elasticsearch:
      hosts: ['${ELASTICSEARCH_HOST:elasticsearch}:${ELASTICSEARCH_PORT:9200}']
      username: ${ELASTICSEARCH_USERNAME}
      password: ${ELASTICSEARCH_PASSWORD}

filebeat-prospectors.yaml
- type: log
      paths:
        - /var/lib/docker/containers/*/*.log
      fields_under_root: true
      json.message_key: log
      json.keys_under_root: true
      processors:
        - add_kubernetes_metadata:
            in_cluster: true
            namespace: ${POD_NAMESPACE}