I find Atlassian's product offering to be incredibly lackluster. For a company that doesn't focus on having a sales team, with a $3bn+ valuation, where is the engineering resources? They have many tickets that have been outstanding for years requesting simple features like these. For example the Jira restful api doesn't support bulk editing of tickets. I'm going to learn Java so I can just write the damn plugin for it myself. I also have to say the Jira restful api could be better... custom field names return as 'customfield_22939', seriously?
"git grep" is easy enough? Of course it defeats the point of having a git repo website... That said, even if they add it, these are the folks responsible for JIRA's search -- don't expect it to be intuitive. At all. ;-)