Not in the UI that I can think of directly.
But the log will have "indexing" lines in it, and I think the admin audit logging will catch it as well, as long as it is enabled.
I'm not entirely sure how much use it might be though - the index is also updated whenever an issue is touched, so technically, the system was partially re-indexed the last time you used it! I'm guessing you mean one of the full re-indexes though (or project re-index?)
I think re-index events are not included in Audit Log (System --> Audit Log), or at least I don't see them and Atlassian documentation don't mention it (https://confluence.atlassian.com/adminjiraserver/auditing-in-jira-applications-938847740.html).
It would be great that this info was included there: re-index type (project or global background/blocking), start and finish.
Meanwhile, I prefer to take a look into log files. It's clear and easy to know when re-index started and finished.
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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