Yang Wang 7969fbb4ab
Cache API key doc to reduce traffic to the security index () ()
Getting the API key document form the security index is the most time consuing part
of the API Key authentication flow (>60% if index is local and >90% if index is remote).
This traffic is now avoided by caching added with this PR.

Additionally, we add a cache invalidator registry so that clearing of different caches will
be managed in a single place (requires follow-up PRs).
2020-10-06 23:49:23 +11:00
..