a request xxx Failed to fetch HTTP status: 504 Followed by Database seems to be overloaded

Immediately after an upgrade or installation, a request xxx Failed to fetch HTTP status: 504 and Database seems to be overloaded messages might appear after a successful login. This is due to index database maintenance. Please wait some time and then attempt to log in to IP Fabric again. If the issue persists for more than an hour, please do not hesitate to contact our Support team.