Google SERPs keep changing for site: searches

[h8dk70]

It's been happening for few days now, sometimes when I search site:example.com I get 89 pages, couple of minutes later the same search will give me 27 pages. Has anyone else experienced the same? and do you know what’s going on?
Thanks.

[trinorthlighting]

Yes, I have been seeing a flux like that all day long.

[Erku]

So, what's going on?

What does this mean? Another update?

[afterburner]

sites I watch are changing, looks like a backlink update is happening or about to happen.

[g1smd]

Google are testing multiple indexes, different indexes spread across the various datacentres. When you hit google.com you hit a random datacentre. Your next search may be from a different one altogether.

.

They also have multiple (or incomplete?) datasets at single IPs, such that if you keep hitting refresh at, say, 66.249.93.104 then you get a different result almost every time too. That is new in the last few weeks.

[h8dk70]

I've checked couple of other sites and the same thing happens. And it's not only for site: searches, link: search has the same problem. Looks like this is affecting everyone.