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 have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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