If you don't see counters on the Cisco ISE dashboard and receive the message "Unable to load Context Visibility page. Exception: Elasticsearch exception [type=search_phase_execution_exception, reason=all shards failed]," you can follow the procedure below.
https://www.cisco.com/c/en/us/support/docs/security/identity-services-engine-23/213610-ise-2-3-rest-sync-context-visibility.html
