The search section of the creative inventory (for example) lists all the items in a convenient, logical order. Currently in the Bukkit API there isn't a way to sort materials in an order that's convenient to a player.

Before 1.13, the Material enum was in the same (or similar?) order as the creative inventory, but in this commit for 1.13-pre7, the order was changed to alphabetical: f8b2086d60942eb2cd7ac25a2a1408cb790c222c

I can make a PR for this change and relevant tests, I just don't know the best way to go about it (re-order the materials, add some kind of ordinal function, etc.)