Google’s John Mueller posted an excellent example of a case of where a webmaster is nervous about a report in Google Webmaster Tools, when in reality, all is good.

He posted this on Google+ and shared a screen shot by Jodi Bennett. The screen shot, as you will see below, shows a complete drop off of indexed pages after the update line.

Here is a picture:

The issue is a non-issue, just a reporting change in Google Webmaster Tools where the index status report now breaks down http vs https and subdirectories. In this case, that is what happened.

John Mueller said:

That is why Google placed the “update” line there, with more details.

Forum discussion at Google+.