Historically there has always been a confusion about Fix Version. To reduce that confusion, I requested asf infra to add target version field for Hive jira and they promptly added that. So, now we have an additional target version for jira tickets. If you are creating new ticket, it will show up on "Create" screen. If you want to add the field on previously created jira, just hit "edit" button and it will show up.
Just to reiterate purpose of two fields: Fix Version : Earliest version on which patch for that jira has landed. It should be updated *after* commit has been made. Target Version : Earliest version on which you are aiming to land the patch. It should be updated *before* commit has been made. Thanks, Ashutosh