You didn't include a version in your query. You also could try using quotes, though this specific entry may not be helped by it (e.g. "in operator"). For most things, you can click a link with the older version and somewhere there is typically a dropdown or something to change the version and, if not, you'll at least know which section/etc. it is in in the new documentation.
If you don't include a version, it's probably going to pull up questions/answers that it finds most match in general and maybe people just aren't asking that question for your version.
I think there's a lot to hate about modern search results, but I also think there's some opportunity to search better. I do miss the days when AND, OR, and NOT operators actually worked all the time and as expected.