Issue: After upgrading to Sentinel 8.5.1, "Visualization server is not ready yet" message is displayed when the event visualization page is opened. The Kibana logs show the following error:
resource_already_exists_exceptionserver{"type":"log","@timestamp":"2022-10-10T13:33:14Z","tags":["warning","savedobjects-service"],"pid":28463,"message":"Another Kibana instance appears to be migrating the index. Waiting for that migration to complete. If no other Kibana instance is attempting migrations, you can get past this message by deleting index .kibana_1 and restarting Kibana."}
Workaround: Run the following commands:
curl -X DELETE localhost:9200/.kibana_1
rcsentinel stopVA
rcsentinel startVA