查询关键字使用一下 QueryParser.escape(keyword),例如：keyword=I/O,否则buildQuery时会出现异常:

org.apache.lucene.queryparser.classic.ParseException: Cannot parse 'I/O': Lexical error at line 1, column 4.  Encountered: <EOF> after : "/O"
	at org.apache.lucene.queryparser.classic.QueryParserBase.parse(QueryParserBase.java:114)
	at io.jpress.module.article.searcher.LuceneSearcher.buildQuery(LuceneSearcher.java:183)
	at io.jpress.module.article.searcher.LuceneSearcher.search(LuceneSearcher.java:104)