Search Engine Roundtable have uncovered a thread which discusses this and say, “If a site is temporarily down, I thought Google would not deindex the site, but give it some more time before they removed the page from the index. According to this thread, that may not be the case.”
This seems terribly unfair since there is no such thing as 100% efficiency and uptime, but makes sense from the user experience point of view, as highlighted by this comment: “Google’s users need to be able to click on the results and see webpages - every time they see nothing it reflects badly on Google - it makes Google’s index feel old and unreliable.”


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