A usage analytics visitor ID uniquely identifies a user in a search interface, whether they’re authenticated or not.
visitorId query parameter is deprecated and has been replaced by the
clientId in newer versions of the Coveo UI libraries.
For compatibility, the new first-party cookie and local storage values are still named
The visitor ID is distinct from the visit ID, which does expire, and the user ID, which is automatically attributed and is used to track authenticated users. It’s also distinct from the client ID, which takes precedence over the visitor ID when both are present.