client.collection.create(
  "Buildings", c -> c.properties(
    Property.object("address", p -> p.nestedProperties(
      Property.text("street"),
      Property.integer("building_nr")
    ),
    Property.objectArray("apartments", p -> p.nestedProperties(
      Property.int("door_nr"),
      Property.number("area")
    )
  )
);

buildings.data.insertMany(
  Map.of(
    "address", Map.of("street", "Broadway", "building_nr", 124),
    "apartments", List.of(
      Map.of("door_nr", 1, "area", 54),
      Map.of("door_nr", 2, "area", 20)
    )
  ),
  Map.of(
    "address", new Address("Broadway", 81),
    "apartments", List.of(
      new Apartment(1, 47),
      new Apartment(2, 95)
    )
  )
);

var building_1 = buildings.query.byId("building-1").get();

assert building_1.properties().get("address") instanceof Map<?, ?>;
assert building_1.properties().get("apartments") instanceof List<?>;

@Collection("Buildings")
record Building(Map<String, Object> address, Apartment[] apartments){}