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Received message intended for raft_id X

My flog is being flooded with messages like this:

Mar 5 16:46:35 appX dockerd[741]: time=“2019-03-05T16:46:35.746352481Z” level=error msg=“received message intended for raft_id 4b38f79fe57cd5d0” from=3f8c4faed6db4982 method="(*Node).ProcessRaftMessage" raft_id=74d75c4c3f928c13

My environment:

# cat /etc/debian_version 
root@app12:~# uname -a
Linux appX 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3 (2019-02-02) x86_64 GNU/Linux
# docker info
Containers: 14
 Running: 14
 Paused: 0
 Stopped: 0
Images: 190
Server Version: 18.09.2
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: active
 NodeID: 9uzalv96fealvtk5xwkr22vk6
 Is Manager: true
 ClusterID: qwn823q3hsp7t07v1fudufwjd
 Managers: 22
 Nodes: 22
 Default Address Pool:  
 SubnetSize: 24
  Task History Retention Limit: 5
  Snapshot Interval: 10000
  Number of Old Snapshots to Retain: 0
  Heartbeat Tick: 1
  Election Tick: 10
  Heartbeat Period: 5 seconds
 CA Configuration:
  Expiry Duration: 3 months
  Force Rotate: 0
 Autolock Managers: false
 Root Rotation In Progress: false
 Node Address:
 Manager Addresses:
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 9754871865f7fe2f4e74d43e2fc7ccd237edcbce
runc version: 09c8266bf2fcf9519a651b04ae54c967b9ab86ec
init version: fec3683
Security Options:
  Profile: default
Kernel Version: 4.9.0-8-amd64
Operating System: Debian GNU/Linux 9 (stretch)
OSType: linux
Architecture: x86_64
CPUs: 8
Total Memory: 29.46GiB
Name: app12
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Experimental: false
Insecure Registries:
Live Restore Enabled: false
Product License: Community Engine

WARNING: No swap limit support

Please advise.