code: @SuppressWarnings("WeakerAccess")
    public void deleteCluster(String instanceId, String clusterId) {
      ApiExceptions.callAndTranslateApiException(deleteClusterAsync(instanceId, clusterId));
    }
docs: Deletes the specified cluster. Please note that an instance must have at least 1 cluster. To
  remove the last cluster, please use {@link BigtableInstanceAdminClient#deleteInstance(String)}.
  
  <p>Sample code:
  
  <pre>{@code
  client.deleteCluster("my-instance", "my-cluster");
  }</pre>