Default Quick ? Can you install Root with stock recovery?

OTA just updated Nexus 5 to 4.4.2. I've lost TWRP and ROOT. Can I use stock recovery to install superuser, if so, how? The reason I'm asking is I don't to start over from scratch if the bootloader has to be unlocked.

Note: I didn't loose Hotspot tethering after OTA 4.4.2 update. It kept all my settings.

Update: I think I've figured out my own question. The bootloader has to be unlocked, so you'll lose your settings and data. Lesson learned; just update using zip in recovery mode next time.