I understand AS 3.1 Canary 1 is new, but I just wanted to make sure it was known that if the 1.2.0-beta-88-Studio3.0-1 plugin is installed, a NoSuchMethodError is thrown during gradle sync that ends up locking up the indexing task (and preventing further use of AS 3.1). Downgrading to the bundled 1.1.51 plugin resolves the issue for now.
https://issuetracker.google.com/issues/68310891