In about two weeks we will be launching a change for published docs. The change will allow published docs that are linked to from a public website to be crawled and indexed, which means they can appear in search results you see on Google.com and other search engines.

Please note that this only applies to docs which you explicitly publish using the 'Publish as web page' or 'Publish/embed' option, and which are linked to from a publicly crawled webpage. This doesn't apply if it's only set to 'Allow anyone with the link to view (no sign-in required)'. If you don't want your published docs to be crawled, then you can un-publish them ...