Read a remote yaml file

read-remote-yaml.yml

- hosts: search_master, search_data
  serial: 1   # run one at a time

  gather_facts: false

  become: yes

  vars:
    # cannot be done as lookup are only on the Ansible controller
    #config: "{{ lookup('file','/etc/elasticsearch/elasticsearch.yml') | from_yaml }}"

  tasks:    

    - command: >
        cat /etc/elasticsearch/elasticsearch.yml
      register:
          raw_config

    - name: output
      vars:
        config: "{{ raw_config.stdout | from_yaml }}"
      debug:
        var: config['cluster.name']