One UI thing we've struggled with is how to tell the user that we don't think there are any good results for the query. It's a very difficult thing to evaluate

One UI thing we've struggled with is how to tell the user that we don't think there are any good results for the query. It's a very difficult thing to evaluate effectively, because most of our notions of a good search result page (obviously) involve there being results on it. But it seems intuitively that there's a big value to quickly and reliably concluding "nope nothing" and moving on. It's a problem exacerbated by the increasing size of our index. It's hard to quickly tell whether you've reached the noise floor of the internet yet.