code: def delete(self):
          
          client = self._instance._client
          client.instance_admin_client.delete_cluster(self.name)
docs: Delete this cluster.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_delete_cluster]
              :end-before: [END bigtable_delete_cluster]
  
          Marks a cluster and all of its tables for permanent deletion in 7 days.
  
          Immediately upon completion of the request:
  
          * Billing will cease for all of the cluster's reserved resources.
          * The cluster's ``delete_time`` field will be set 7 days in the future.
  
          Soon afterward:
  
          * All tables within the cluster will become unavailable.
  
          At the cluster's ``delete_time``:
  
          * The cluster and **all of its tables** will immediately and
            irrevocably disappear from the API, and their data will be
            permanently deleted.