How does the webflux, of spring5 return custom json data?

problem description

how does the webflux, of spring5 return custom json data?

related codes

/ / Please paste the code text below (do not replace the code with pictures)
when webflux is not available on the server, my service is written like this

public Map<String, Object> registerService(User user) { 
        Map<String, Object> map = new HashMap<>(8); 
        map.put("status":1); 
        userRepository.save(user); 
        return map;

now when you change it to webflux, you won"t get the same result as above

public Mono<Map<String, Object>> registerService(User user) { 
        Map<String, Object> map = new HashMap<>(8); 
        map.put("status", 1); 
        userRepository.save(user); 
        return Mono.just(map); 
    }

what result do you expect? What is the error message actually seen?

now the return result of webflux is {"status": 1}, and the returned json data is that I want me, but there is no user, inserted in mongo. I just want to return my custom json data as above, and insert the data

at the same time.
Aug.20,2021

public Mono registerService (User user) {

    Map<String, Object> map = new HashMap<>(8); 
    map.put("status", 1); 
    return userRepository.save(user); 
}

Map<String, Object> map = new HashMap<>(8); 
map.put("status", 1); 
return userRepository.save(user).map(user->map); 
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1c30279-32a0d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c30279-32a0d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?