private StatusCodeResult ValidateCluster(ClusterRequest clusterRequest, bool fromCreating)
        {
            if (clusterRequest == null || !ModelState.IsValid)
            {
                return(BadRequest());
            }

            int?managerId = clusterRequest.ManagerId;

            if (managerId != null)
            {
                if (userRepository.GetUserById(managerId.GetValueOrDefault()) == null)
                {
                    ModelState.AddModelError("", $"UserId {managerId} not found");
                    return(StatusCode(404));
                }
                else if (fromCreating && clusterRepository.GetClusterByManagerId(managerId.GetValueOrDefault()) != null)
                {
                    ModelState.AddModelError("", $"UserId {managerId} is already associated with another cluster");
                    return(StatusCode(400));
                }
            }

            return(NoContent());
        }