I found tons of information about how to do very complex searches but not one article explaining how to just find a ticket by its number. i.e. AJAX-642
When I type that into search field it says:
"Error in the JQL Query: Expecting operator before the end of the query. The valid operators are '=', '!=', '<', '>', '<=', '>=', '~', '!~', 'IN', 'NOT IN', 'IS' and 'IS NOT'."