I've been testing Swiftype and works very well. The only problem I've had is with the use of special characters for words in Spanish. It is normal in the searches that you do not use special characters, so the content does not appear. Example:
If I search the word "construccion" will not find anything with "construcción". I hope you can improve this.
On the other hand is very useful I use this search engine on a wiki. I have developed a "custom post type" for the wiki. I know I should disable indexing via robots.txt for my content, with exception of the wiki. And then have a very good search engine content for the wiki. The question is how do I add a new search engine that works only with swiftype and without transforming my main search engine?