ERROR: password is not a legal parameter of an Ansible Play

---
- hosts: all
  user: root
  vars:
  password: jbJe1oRlSZKQ6
  tasks:
    - user: name=testuser password={{password}}

vars:
  password: hashed_password

mkpasswd --method=SHA-512

pip install passlib

python -c "from passlib.hash import sha512_crypt; import getpass; print sha512_crypt.encrypt(getpass.getpass())"