With DisMax, and simple query which is single double-quote character, SOLR responds with
500 org.apache.solr.common.SolrException: Cannot parse '': Encountered "" at line 1, column 0. Was expecting one of: ... " " ... "-" ... "(" ... "*" ... ... ... ... ... "[" ... "{" ... ... org.apache.lucene.queryParser.ParseException: It is not polite neither to user's input nor to HTTP specs... > while i agree that you don't wnat to expose your end users > directly to > Solr (largely for security reasons) that doesn't mean you *must* > preprocess user entered strings before handing them to dismax > ... dismax's > whole goal is to make it posisble for apps to not have to worry about > sanitizing user inputed query strings.