Structure caches can be cleared for specific users or the whole Jira instance. In Jira Data Center, it's possible to clear caches for the current node or all nodes in the cluster.
Jira's own caches are not affected by this action, only Structure caches are cleared.
There are two ways to clear Structure caches:
Admin-only Method
Navigate to Administration | Structure | Support
Scroll down to the Clear Caches section and select the caches to be cleared.
Click Clear Caches.
All-user Method
The Clear caches option is also available to admins and Structure users via the Info pop-up in the bottom right corner of the Structure panel.