public Mono<Boolean> hasPendingFriendRequest(
            @NotNull Long requesterId,
            @NotNull Long recipientId) {
        try {
            Validator.notNull(requesterId, "requesterId");
            Validator.notNull(recipientId, "recipientId");
        } catch (ResponseException e) {
            return Mono.error(e);
        }
        return userFriendRequestRepository.hasPendingFriendRequest(requesterId, recipientId);
    }
@author James Chen
@implNote The status of friend requests never become EXPIRED in MongoDB automatically (admins can
          specify them to expired manually though) even if there is an expireAfter property
          because Turms will not create a cron job to scan and expire requests in MongoDB.
          Instead, Turms transforms the status of requests when returning them to users or admins
          for less resource consumption and better performance to expire requests.
turms-service/src/main/java/im/turms/service/domain/user/service/UserFriendRequestService.java