@version field added by logstash as string type

I'm trying to clean up my fields, and noticing that logstash by default sets @version field it adds, to type string.

This seems horribly wrong ? especially if one wanted to use that field to f.ex. find all logs using certain logstash format (which I believe is what @version indicates?).

Shouldn't it be an int ? (which becomes a long in es)