code: public static BigtableClusterUtilities forInstance(String projectId, String instanceId)
        throws IOException, GeneralSecurityException {
      return new BigtableClusterUtilities(
          BigtableOptions.builder().setProjectId(projectId).setInstanceId(instanceId).build());
    }
docs: Creates a {@link BigtableClusterUtilities} for a projectId and an instanceId.
  
  @param projectId
  @param instanceId
  
  @return a {@link BigtableClusterUtilities} for a specific projectId/instanceId.
  @throws GeneralSecurityException if ssl configuration fails
  @throws IOException if some aspect of the connection fails.