Vader prickles so violently there's almost a haze around him as soon as Luke mentioned the word "Hutt". Luckily for them both Luke hasn't bonded enough with him for the echo of memories to carry easily, there are memories Luke doesn't need. Such as being barely more than a toddler and watching a playmate, freshly cooked, being eaten by Gardulla.

"He shouldn't have those." His tone is icy. "Do you want get them? I can show you how to open them." A pause. "I can open the Sith ones. So can you. It is the process to open the Jedi ones, but only a Jedi can open them. It's why Palpatine occasionally orders Jedi captured alive."

It's also why Vader made sure to kill them.