docs: public void addFamilyWithMaxVersionsRule() {
      System.out.printf("%nCreating column family %s with max versions GC rule%n", COLUMN_FAMILY_2);
      // [START bigtable_create_family_gc_max_versions]
      // Creates a column family with GC policy : most recent N versions
      // where 1 = most recent version
  
      // Defines the GC policy to retain only the most recent 2 versions.
      VersionRule versionRule = GCRULES.maxVersions(2);
  
      // Creates column family with given GC rule.
      try {
        // ModifyColumnFamiliesRequest can be used both for adding and modifying families, here it is
        // being used to add a family
        ModifyColumnFamiliesRequest columnFamiliesRequest =
            ModifyColumnFamiliesRequest.of(tableId).addFamily(COLUMN_FAMILY_2, versionRule);
        adminClient.modifyFamilies(columnFamiliesRequest);
        System.out.println("Created column family: " + COLUMN_FAMILY_2);
      } catch (AlreadyExistsException e) {
        System.err.println(
            "Failed to create column family with rule, already exists: " + e.getMessage());
      }
      // [END bigtable_create_family_gc_max_versions]
    }