How to temporarily hide a site from search engines?

Question

Search Engine Optimization

There is a site that is in the top of search engines, you need to hide it from users for a while, then return it to search engines again. How can I do that?

Answer 1

This is nonsense ...
Thus, the site may fall in the search results.
Why hide?
You can't do work on the local server?
You can switch the site to the maintenance mode through the settings, but removing it from the search results is not a matter of the 1st day, since bots do not monitor your site every second (Google Web Developer Tools will help here)

Answer 2

302 + canonical

Answer 3

Definitely a 503 redirect!
One SaaS had a problem a year ago (Voice). I don’t know for what reason (they never explained) they completely removed the system + all the databases. As a comment, they said that the hard drive had crashed, etc. (the issue of backups remained open). As a solution, they were asked to use draft plugs with a 503 code.
Some stores moved to new platforms, some were waiting for information to be restored.
The 503 redirect has been hanging on some platforms for over a month.
From my own experience in this situation.
1) 2 stores were restored after a month of 503 redirects. There was a drawdown, positions recovered over time
2) One store moved to a new platform after 2 weeks. I helped to import data from recovered data.
By the way, who cares, Dejan seemed to have a study where he checked how a 404 response affects the loss of site positions and how long a page can be turned off (use 404).