I want to ask how to edit the world already. For example, I have a survival map that has been successfully created and works for some time and now I want to change the texture of the world, so that the "y: 100" coordinates become water and that applies globally.
Edit 1: If you have ever worked with the worldedit plugin, it is similar to the "y: 100" position and using the // fill command, but I mean it is automatic and applies worldwide. When players go to a new chunk for example.
Edit 2: I am using the plugin to create an "OpenGuideApplication - A free, and better alternative to EEC - Spigot/bukkit not Mod"