---
    - hosts: mongo-cluster-*
      remote_user: root

      roles:
      - mongodb

      pre_tasks:
      - name: get mongo_group_name
        set_fact: mongo_group_name="{{ item }}"
        with_items: group_names
        when: item | search("mongo-cluster-*")

      - name: get mongo_replica_set
        set_fact: mongo_replica_set="{{ mongo_group_name }}"
        when: mongo_replica_set is not defined