如何使用spring 5反应式存储库在即火即忘模式下进行保存

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
</dependency>

@Document(collection = "items")
public class Item {
    @Id
    private String id;
    private String name;
    // 其他字段和对应的getter和setter方法
}

@Repository
public interface ItemRepository extends ReactiveCrudRepository<Item, String> {
    Flux<Item> findByName(String name);
    // 其他查询方法
}

@Service
public class ItemService {
    private final ItemRepository itemRepository;

    public ItemService(ItemRepository itemRepository) {
        this.itemRepository = itemRepository;
    }

    public Mono<Item> saveItem(Item item) {
        return itemRepository.save(item);
    }
}

@RestController
public class ItemController {
    private final ItemService itemService;

    public ItemController(ItemService itemService) {
        this.itemService = itemService;
    }

    @PostMapping("/items")
    public Mono<Item> saveItem(@RequestBody Item item) {
        return itemService.saveItem(item);
    }
}