ansible + &

I’d like to start jmeter on remote host and run the command in background but the command “&” doesn’t work

this playbook starts jmeter :
- hosts: JMETER_REMOTE_VM
sudo: True
user: xxxx
tasks:
- shell: chdir=~/apache-jmeter-2.13/bin/ bash jmeter-server

but this one doesn’t :
- hosts: JMETER_REMOTE_VM
sudo: True
user: xxxx
tasks:
- shell: chdir=~/apache-jmeter-2.13/bin/ bash jmeter-server &