In Star Wars: The Last Jedi, we see that Ahch-To is where Luke was hiding and the same place
has the ancient Jedi temple. Also, while showing the tree branch shelf to Rey, he says that this was built many many years ago just for the purpose of storing the ancient Jedi texts.
Considering all this, wouldn't the other members of the force (Leia, Maz Kanata, Kylo Ren etc) know that Ahch-To could have possibly been where Luke is hiding? Instead of going to the trouble of hiding/finding the map to his location, couldn’t the Resistance or The First Order just send out their army on a hunt
to the historic Jedi planet?