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_1 dashboards 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_1 dashboards instance appears to be migrating the index. Waiting for that migration to complete. If no other kibana_1 dashboards instance is attempting migrations, you can get past this message by deleting index .kibana_1 dashboards and restarting kibana dashboard."}
Workaround: Run the following commands:
curl -X DELETE localhost:9200/.kibana_1 dashboard
<install-location-path>/bin/server.sh stopVA
<install-location-path>/bin/server.sh startVA