Kubernetes: Deployment API version apps/v1beta2 is being changed to extensions/v1beta1 on creation

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

What happened:

When I create an example Deployment found at kubernetes/website with api version apps/v1beta2, the api version I see when I perform kubectl get deploy nginx-deployment -o yaml is extensions/v1beta1.

What you expected to happen:

I expect the api version to be apps/v1beta2.

How to reproduce it (as minimally and precisely as possible):

• Use client version v1.9.1 and server version v1.8.4.
• Create the example Nginx Deployment file:
  Bash kubectl create -f https://raw.githubusercontent.com/kubernetes/website/snapshot-final-v1.8/docs/tasks/run-application/deployment.yaml
• Check that the api version is apps/v1beta2 (which it isn't):
  Bash kubectl get deploy nginx-deployment -o yaml | grep apiVersion

Anything else we need to know?:

Not that I can think of.

Environment:

• Kubernetes version (use kubectl version):

Bash Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.1", GitCommit:"3a1c9449a956b6026f075fa3134ff92f7d55f812", GitTreeState:"clean", BuildDate:"2018-01-04T11:52:23Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"} Server Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.4", GitCommit:"9befc2b8928a9426501d3bf62f72849d5cbcd5a3", GitTreeState:"clean", BuildDate:"2017-11-20T05:17:43Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}

• Cloud provider or hardware configuration:

  AWS, deployed via kops v1.8.0 (git-5099bc5)

• OS (e.g. from /etc/os-release): ~

• Kernel (e.g. uname -a): ~

• Install tools:

  kops v1.8.0 (git-5099bc5)

• Others: ~