Sudden drop in index, is this a bug?

[EcommerceSite]

We haven't made any sort of changes to the website recently and we had a 10% drop in indexed pages. I know there is rumors of a bug, has this happened to anyone else?

[tretanto]

Hi,

I have not seen anything in any of my properties so far but it is definitely more than a rumor; Webmaster Trends Analyst from Google confirmed via Twitter:

https://twitter.com/methode/status/634308230940872704

[EcommerceSite]

I saw that but that is for the sitemap index, is that considered the same as total amount of indexed pages?

[EcommerceSite]

Just saw this https://www.seroundtable.com/google-search-console-index-status-count-drop-20813.html it is a bug.

[tretanto]

Good point. Sorry, I didn't realize the statement was specifically about the Sitemap feature. However, it's not unlikely that both issues were related.