I am a newb coder in a startup and I am implementing search of documents in a directory in a web host.
I am comparing Lucene/Solr, Whoosh, Sphinx and Xapian. Whoosh is natively python. But I want your opinions on it too. Which of these have 

mature and easy to use and install interfaces with python? (Whoosh is a no-brainer)
no chance for crashes, bottlenecks and other failures
best documented interface (Im not reading PHP docs because python docs were sparse)
easiest to get up and running (only one has a quick-start tutorial)
Use Whoosh if you don't need the speed, extra features of the alternatives. It's great, has a nice API, good documentation. My second choice would probably be Xapian, which is fast and has a fairly decent API. They are all fairly mature products. If you don't know what you really need, I'd just go with Whoosh for now.
Among Lucene/Solr, Whoosh, Sphinx, Xapian which integrates best with python?