docker service create prints progress-bars on stdout instead of stderr

Description

I noticed that docker service create prints the progress-bars on stdout instead of stderr;

docker service create nginx:alpine 2> /dev/null
clu6qi8pcg2fbnhxpuusdk0iw
overall progress: 1 out of 1 tasks
1/1: running   [==================================================>]
verify: Service converged

Because of this, it's not possible to redirect the progress information, and still use the printed id for scripting;

docker service create nginx:alpine 2> /dev/null | xargs docker service ps
ID                  NAME                IMAGE               NODE                DESIRED STATE       CURRENT STATE           ERROR               PORTS
yy1ra43a6r10        cranky_poincare.1   nginx:alpine        docker-desktop      Running             Running 5 seconds ago                       
no such service: overall
no such service: progress:
no such service: 0
no such service: out
no such service: of
no such service: 1

Using --detach disables the progress bars, so works as a workaround;

docker service create --detach nginx:alpine 2> /dev/null | xargs docker service ps
ID                  NAME                 IMAGE               NODE                DESIRED STATE       CURRENT STATE                    ERROR               PORTS
l07wdom4zwlt        gifted_chebyshev.1   nginx:alpine                            Running             Pending less than a second ago          

Describe the results you received:

$ docker service create nginx:alpine 2> ./err.log
clu6qi8pcg2fbnhxpuusdk0iw
overall progress: 1 out of 1 tasks
1/1: running   [==================================================>]
verify: Service converged

$ cat err.log 
# empty

Describe the results you expected:

$ docker service create nginx:alpine 2> ./err.log
n8ed2qh8g6yi4d1ofi3kn7n16

$ cat err.log 
overall progress: 0 out of 1 tasks
1/1:  
overall progress: 0 out of 1 tasks
overall progress: 1 out of 1 tasks
verify: Waiting 5 seconds to verify that tasks are stable...
verify: Waiting 4 seconds to verify that tasks are stable...
verify: Waiting 3 seconds to verify that tasks are stable...
verify: Waiting 2 seconds to verify that tasks are stable...
verify: Waiting 1 seconds to verify that tasks are stable...
verify: Service converged

Output of docker version:

Client: Docker Engine - Community
 Version:           18.09.1
 API version:       1.39
 Go version:        go1.10.6
 Git commit:        4c52b90
 Built:             Wed Jan  9 19:33:12 2019
 OS/Arch:           darwin/amd64
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          18.09.1
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.6
  Git commit:       4c52b90
  Built:            Wed Jan  9 19:41:49 2019
  OS/Arch:          linux/amd64
  Experimental:     true

Output of docker info:

not relevant

Start at the docker service create command entry point and reproduce the reported stdout/stderr behavior using the redirection examples. Done means the service ID remains on stdout while progress and verification output go to stderr, without changing the --detach workaround.