Eschatology is spelled with an 'h'.
I'm surprised you didn't find anything on Rapture. Even if you don't have lots of dispensationalist works in your library (I'm not sure how Scholar's stacks up in that regard), there are at least some major dictionary articles on it. I'm pretty much amillenialist in my eschatology and tend not to purchase dispensationalist resources if I can help it, but even in my library there are over 5000 hits for rapture. Are you sure you didn't have a typo when you searched for it? Or maybe you had selected a limited collection to search in instead of your Entire Library (a common mistake; last search you did might have needed the restriction but you forgot to remove it).
You could also try doing a search for tribulation OR pretrib* OR postrib* OR midtrib*. You might also want to include the hyphenated alternatives (OR pre-trib* OR post-trib* OR mid-trib*).
Once you find discussions of the verses people associate with belief in a rapture, you could search your commentaries or your entire library for discussions of these verses. Use the search syntax <John 14:3> to do this.
Other terms related to "end times" or "eschatology" include "second coming" , "last days" , eschaton and consummation.
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