aws_resource_actions is not giving expected outcome

[arshad zameer]

I have a playbook with several roles to be performed on AWS instances. I want to get the list of all aws resource actions used on the ec2 modules so i can create specific IAM role with those permisions. But i'm unable to get the specified output as per the documentation. I have done the changes as per the documentaion. Modified the ansible.cfg to

[defaults]
callback_whitelist = aws_resource_actions

Also on the playbook i have given the group as follow- name: Get instance details and attach ebs volumes

  hosts: some hosts
  module_defaults:
    group/aws:
      debug_botocore_endpoint_logs: True
  gather_facts: yes
  roles:
    - a_role

Also i have added modified the ec2 task also to add this

- name : Create EBS one
  ec2_vol:
    region: "{{ region }}"
    instance: "{{ item}}"
    device_name: "{{ device }}"
    volume_type: "{{ vol_type }}"
    volume_size: "{{ vol_size }}"
    delete_on_termination: yes
    encrypted: yes
    debug_botocore_endpoint_logs: yes
    tags:
      Name: "{{ vol_name }}"      
  register: EBSdetails

Can anyone point me out what i have missed?