Autoscaling Policy config associated with the cluster.
.. attribute:: policy_uri
Optional. The autoscaling policy used by the cluster. Only
resource names including projectid and location (region) are
valid. Examples: - https://www.googleapis.com/compute/v1/p
rojects/[project_id]/locations/[dataproc_region]/autoscalingPo
licies/[policy_id] - projects/[project_id]/locations/[dat
aproc_region]/autoscalingPolicies/[policy_id] Note that the
policy must be in the same project and Dataproc region.