title: Ingress migration process
body: <p>I have 1 question regarding migration from Nginx controller to ALB. Does k8s during migration will create a new ingress controller and switch smoothly services to new ingress or will delete an old one and after that will create a new ingress? Why I ask that, because we want to change ingress class and we would like to minimize any downtime. Sorry for newbie question, because I didn't find any answer in doc</p>