api:json-schema:generate what are valid --operation arguments

[tacman]

What are valid operations? I've tried Get and the definition names, but I'm just guessing.

bin/console api:json-schema:generate --help
Description:
  Generates the JSON Schema for a resource operation.

Usage:
  api:json-schema:generate [options] [--] <resource>

Arguments:
  resource                   The Fully Qualified Class Name (FQCN) of the resource

Options:
      --operation=OPERATION  The operation name

@todo: update https://api-platform.com/docs/core/json-schema/ docs when this is answered.