How to disconnect only one element using MutationObserver in JavaScript?

Well, I want to do something like this:

const config_observer = { attributes: true};
const observer = new MutationObserver(function(mutations) {
  console.log("changed")
});

observer.observe(document.body.querySelector("#random-id"), config_observer);
observer.observe(document.body.querySelector("#something"), config_observer);

document.body.querySelector("button").addEventListener("click", () => {
  observer.disconnect(document.body.querySelector("#something"));
});

I know that the disconnect function doesn’t have parameters. So, is there some way to do this or something like that?

Thanks Advanced.