There's no option to disable pipelining
for a single task AFAIK. Keep in mind that Ansible 1.5 is still in development stages.
However, as a workaround you can run your task on a separate playbook passing the pipelining=False
environment variable to override the value of your ansible.cfg
file:
ansible-playbook -i ./your-inventory-file -e "pipelining=False" your-no-pipeline-playbook.yml
This as per described here (from Ansible docs):
Ansible also allows configuration of settings via environment variables. If these environment variables are set, they will override any setting loaded from the configuration file. These variables are for brevity not defined here, but look in ‘constants.py’ in the source tree if you want to use these. They are mostly considered to be a legacy system as compared to the config file, but are equally valid.
and here:
https://github.com/ansible/ansible/blob/devel/lib/ansible/constants.py