在
StandardAnalyzer和中设置的默认停用词
EnglishAnalyzer是
StopAnalyzer.ENGLISH_STOP_WORDS_SET，它们是：
"a", "an", "and", "are", "as", "at", "be", "but", "by","for", "if", "in", "into", "is", "it","no", "not", "of", "on", "or", "such","that", "the", "their", "then", "there", "these","they", "this", "to", "was", "will", "with"
StopFilter本身没有定义默认的停用词集。
