docs: public void listClusters() {
      System.out.println("\nListing Clusters");
      // [START bigtable_get_clusters]
      try {
        List<Cluster> clusters = adminClient.listClusters(instanceId);
        for (Cluster cluster : clusters) {
          System.out.println(cluster.getId());
        }
      } catch (NotFoundException e) {
        System.err.println("Failed to list clusters from a non-existent instance: " + e.getMessage());
      }
      // [END bigtable_get_clusters]
    }