The advantages of a zero-character prefix default are that it's back-compatibile and that it will find more matches, when spelling differences are in the first characters.
I prefer this default.
Anyone using QueryParser needs to be aware of the issues of exposing fuzzy queries, range queries, and any other types the syntax supports. It would not be Lucene's fault if a system with millions of documents is exposed through QueryParser and fuzzy queries take a bit longer or thrown a TooManyClauses exception.
Erik
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