docs: public void printModifiedColumnFamily() {
      System.out.printf("%nPrint updated GC rule for column family %s%n", COLUMN_FAMILY_1);
      // [START bigtable_family_get_gc_rule]
      try {
        Table table = adminClient.getTable(tableId);
        Collection<ColumnFamily> columnFamilies = table.getColumnFamilies();
        for (ColumnFamily columnFamily : columnFamilies) {
          if (columnFamily.getId().equals(COLUMN_FAMILY_1)) {
            System.out.printf(
                "Column family: %s%nGC Rule: %s%n",
                columnFamily.getId(), columnFamily.getGCRule().toString());
          }
        }
      } catch (NotFoundException e) {
        System.err.println("Failed to print a non-existent column family: " + e.getMessage());
      }
      // [END bigtable_family_get_gc_rule]
    }