Filebeat not sending data to elasticsearch

I've installed elasticsearch 8.5 and Kibana 8.5 in my kubernetes cluster simply applying the official helm file in the elastic repo. Now I'm trying to install filebeat with the following conf:

    filebeat.inputs:
    - type: container
      paths:
      - "/var/log/app.log"
      processors:
        - add_kubernetes_metadata:
            host: ${NODE_NAME}
            in_cluster: true

and

output.elasticsearch:
      hosts: ['${ELASTICSEARCH_HOST:elasticsearch}:${ELASTICSEARCH_PORT:9200}']
      username: ${ELASTICSEARCH_USERNAME}
      password: ${ELASTICSEARCH_PASSWORD}
      protocol: https
      ssl.certificate_authorities: ["/usr/share/filebeat/certs/ca.crt"]

Our apps are writing logs in pod container under /var/log/app.log but it seems filebeat does not read the log or not send it to elasticsearch because no index are created in elastic.

How can I solve the problem? What am I doing wrong?

Thanks

This is a working config (Paths etc. needs adaption)

daemonset:
  extraEnvs:
    - name: "ELASTICSEARCH_USERNAME"
      valueFrom:
        secretKeyRef:
          name: elasticsearch-master-credentials
          key: username
    - name: "ELASTICSEARCH_PASSWORD"
      valueFrom:
        secretKeyRef:
          name: elasticsearch-master-credentials
          key: password

filebeatConfig:
  filebeat.yml: |
    logging.metrics.enabled: false
    filebeat.inputs:
      - type: container
        paths:
          - /var/log/containers/agri-check*.log
        json:
          keys_under_root: true
          overwrite_keys: true
        processors:
          - add_kubernetes_metadata:
              host: ${NODE_NAME}
              matchers:
                - logs_path:
                    logs_path: "/var/log/containers/"
      - type: container
        paths:
          - /var/log/containers/*.log
        exclude_files: ['.*/agri-check.*$']
        processors:
          - add_kubernetes_metadata:
              host: ${NODE_NAME}
              matchers:
                - logs_path:
                    logs_path: "/var/log/containers/"

    output.elasticsearch:
      host: '${NODE_NAME}'
      hosts: "https://elasticsearch-master:9200"
      username: '${ELASTICSEARCH_USERNAME}'
      password: '${ELASTICSEARCH_PASSWORD}'
      protocol: https
      ssl.verification_mode: none