docs: public void deleteInstance() {
      System.out.println("\nDeleting Instance");
      // [START bigtable_delete_instance]
      try {
        adminClient.deleteInstance(instanceId);
        System.out.println("Instance deleted: " + instanceId);
      } catch (NotFoundException e) {
        System.err.println("Failed to delete non-existent instance: " + e.getMessage());
      }
      // [END bigtable_delete_instance]
    }