There's a CODESEARCH_STATUS file that has the timestamp of the last crawl:
https://cs-staging.chromium.org/chromium/CODESEARCH_STATUS

And there's monitoring for that too: http://shortn/_sc0EalD8WZ

Note in the future we'll switch to querying git directly for file and directory contents, so updates should show up immediately.  The search index will still lag behind though.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

CS queries Git directly these days, so updates are almost instant. I've renamed this bug to be search-specific (search still lags behind by up to a few hours).