Exact match search with wildcard using query_string not working

[telebh (Hanan)]

I am newbie to ES and would need help search phrase with wildcard in query_string does not work, as it seems that query_string treat wildcard "i.e. ?" as a character. for example i need to search for something like this"

"query_string":
{
"query": ""imperial colle?e london""
"fields": ["audoc.affil"]
}