Gmail has now introduced another new feature to its Labs. This feature is now related to searching department. Unless you enable this “Search Autocomplete” in Gmail you can’t access this feature. Once you enable this feature Gmail will try to finish our query using names and email addresses of our contact list, built in Gmail sections like “Starred messages” and more advanced like “has photos” or “unread messages“.
Click to know about Filter Import and Export in Gmail Labs
Moreover, this new feature will be more useful to you, if your search includes advanced operators like to: or from: because it is now easier to enter the sender or the recipient.