Privileges: CLUSTER_MODIFY

Upgrade connector agents to the version of the connector agent installer the cluster ships. Only connections of type connector agent are eligible. The request body decides the scope: an empty JSON object upgrades every connector agent under all tenants (fleet-wide); tenantIds upgrades all connections under the listed tenants; connectionIds upgrades just those connections; both lists may be combined. The upgrade is processed asynchronously by the cluster. This API targets only connector agent type connections. If a non connector agent type connection is provided as part of connectionIds, entire request will be rejected with an error. By default, the upgrade is retried forever and is configurable via the retryForever flag. This returns a UUID that can be used to track the upgrade progress.