It should be noted that this just looks for any instances of word strings and pays no attention to context for example there is a person with the signature "Buy the low, sell the high, walk away at the top" which will get a hit for " top ".
Surprisingly there are 0 instances of "this is the top" or "this is the bottom" in the es journal. (which is quite a contrast from other places here on ET).
However I did look for instances of " top " and " bottom "