Thanks Jay, that was exactly the issue I was facing. My kubectl version was 1.14, I got to know that this restart feature was added from 1.15. It is working fine now, even the below command is working that I am able to restart the deployment using single command
Kubectl rollout restart deployment -n apps
But want to check with you one thing, we are using AWS EKS, which has Kubernetes version 1.14, can we use a kubectl client of higher version to take to eks api of 1.14?
Thanks again for fixing my issue 