I have a group of users that want to make a lot of custom fields within their JIRA project. I started to make some changes they requested and got a banner atop of the project recommending that I re-index, which scared me. I have a lot of custom fields to enter into this project. What I don't know is if the re-indexing affects just my project or the entire database. I am a new admin. and I have put this question out there to the more experienced people within my group and no one has responded so I am putting this question out to the Atlassian answers forum for general information.
Re-indexing affects the whole system. It basically deletes the index and rebuilds it from scratch, from the data in the database.
Best bet is to make all your changes and then re-index when they're all done, as running a one-off indexing operation is faster than doing it after every change.
The message is also misleading in my humble opinion - it appears far too frequently, often for changes that do NOT need a reindex. It's often overkill, but you'll only know when after you've been a Jira admin for a while...
Our admins talk to each other before hitting re-index.
The length of time is proportional to the number of issues you have in your database.
If it's a few hundred, I wouldn't worry about the downtime. If it's tens of thousands, you'll cause significant downtime, so book it for out-of-hours
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