This happens too often to send the entire stack trace to standard error every time it does.  This is a handled exception that's not anything for people to worry about hence not wanting to freak people out by sending an unnecessary stack trace to the log whenever it happens.

People tend to filter out components in their logging configuration that they deem too chatty or are dumping things like stack traces unnecessarily to the logs.  I want to recognize this and be responsible with our logging.