code: public static BigtableClusterUtilities forAllInstances(String projectId)
        throws IOException, GeneralSecurityException {
      // '-' means all instanceids.
      return new BigtableClusterUtilities(
          BigtableOptions.builder().setProjectId(projectId).setInstanceId("-").build());
    }
docs: Creates a {@link BigtableClusterUtilities} for all instances in a projectId.
  
  @param projectId
  
  @return a {@link BigtableClusterUtilities} for a all instances in a projectId.
  @throws GeneralSecurityException if ssl configuration fails
  @throws IOException if some aspect of the connection fails.