I have the same messages in my log on the SHC captain.
02-14-2017 07:43:04.655 +0100 ERROR SHCArtifactId - The artifactID "rt_user_c3BsdW5rX21ndF9tb24__appname__RMD56c49e503d8c06396_at_1487052704_53_C8DDA17B-D35A-49E1-BBEE-93655CCE6102" contains the GUID "C8DDA17B-D35A-49E1-BBEE-93655CCE6102". This GUID does not match the member's current GUID, "69204358-A333-41AD-BC4B-B531FB108AFE". This error can occur if you changed the member's GUID. If you did change the GUID, you must remove the member from the cluster, clean it, and add it back into the cluster. See the Distributed Search manual for a procedure to accomplish these steps.
I tried to find this artifactID in the dispatch folder, but it's not there.
The GUID in the artifactID is from another SHC member (splunksh2), which is online and fully functional, see shcluster-status below ( yes there is no splunksh3 at the moment, never has been in this current setup)
Captain:
dynamic_captain : 1
elected_captain : Tue Feb 14 07:06:20 2017
id : 7D31EBEB-5B88-45B3-B85C-059563FB2002
initialized_flag : 1
label : splunksh1
mgmt_uri : https://splunksh1:8089
min_peers_joined_flag : 1
rolling_restart_flag : 0
service_ready_flag : 1
Members:
splunksh1
label : splunksh1
mgmt_uri : https://splunksh1:8089
mgmt_uri_alias : https://splunksh1:8089
status : Up
splunksh2
label : splunksh2
last_conf_replication : Tue Feb 14 07:45:29 2017
mgmt_uri : https://splunksh2:8089
mgmt_uri_alias : https://10.10.10.90:8089
status : Up
splunksh4
label : splunksh4
last_conf_replication : Tue Feb 14 07:45:28 2017
mgmt_uri : https://splunksh4:8089
mgmt_uri_alias : https://10.10.10.97:8089
status : Up
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