title: How to get the existing AKS using compute target
body: <p>How to get the existing AKS from the notebook that I have already added to AML.
  Create the cluster</p>
  
  <pre><code>attach_config = AksCompute.attach_configuration(resource_id=resource_id)
  aks_target = ComputeTarget.attach(workspace=ws, name=create_name, attach_configuration=attach_config)
  aks_target.wait_for_completion(True)
  </code></pre>