Noise from coolant reservoir normal? 2000 Ford Focus Zx3

After driving for about 30 minutes I checked my engine and hear noise coming out near the coolant reservoir cap. It sounds like air pressure trying to escape out of the cap and bubbles going into the reservoir. Is that normal? I just bought the car a week ago.

https://reddit.com/link/1t7bpvv/video/lxqzh6r8pxzg1/player