docs: public int purgeTree(final int tree_id, final boolean delete_definition) 
      throws Exception {
      if (delete_definition) {
        LOG.info("Deleting tree branches and definition for: " + tree_id);
      } else {
        LOG.info("Deleting tree branches for: " + tree_id);
      }
      Tree.deleteTree(tsdb, tree_id, delete_definition).joinUninterruptibly();
      LOG.info("Completed tree deletion for: " + tree_id);
      return 0;
    }