Can't find how to get ClusterToken in the Swagger definition.

- **Package Name**: azure-mgmt-containerservice
- **Package Version**: 21.1.0
- **Operating System**: Windows11
- **Python Version**: 3.8

**Describe the bug**
An error was given when I used the `begin_run_command` operation of `azure-mgmt-containerservice`:
```
azure.core.exceptions.HttpResponseError: (MissingAADClusterToken) This cluster have Azure Active Directory enabled, .clusterToken is required.
Code: MissingAADClusterToken
Message: This cluster have Azure Active Directory enabled, .clusterToken is required.
```
**by swagger definition, I can't know where and how to get the `clusterToken`**

**To Reproduce**
Steps to reproduce the behavior:

Configure the certificate and run the following code:
```python
result = client.managed_clusters.begin_run_command(
resource_group_name='',
resource_name='',
request_payload={
"command": "kubectl apply -f ns.yaml",
"context": "xxxx",
"clusterToken": ''
}
)
```
**Expected behavior**
Get `clustertoken` information normally.

Start with the Swagger definition for azure-mgmt-containerservice and the managed_clusters.begin_run_command request payload, then compare it with the Azure Kubernetes Service run-command behavior described in the error. Done means the definition or accompanying guidance clearly identifies how clusterToken is obtained and supplied for Azure Active Directory-enabled clusters.

Written by the indexing model from the issue text.