I'm still trying to figure out how important it is to have exact phrase match searches working, and what the cost would be. Stopwords prevent exact phrase matches from working with the current lucene index (when the phrase contains a stopword, which it usually does); configuring other indexes just to allow this seems overkill. It may be that the way we're doing things now is fine -- although I notice that the minus sign does not work, so there's something I have to fix there.