public @NonNull Builder<C> futureHandler(
                final CommandExecutionHandler.@NonNull FutureCommandExecutionHandler<C> commandExecutionHandler
        ) {
            return this.handler(commandExecutionHandler);
        }
Specifies the command execution handler.

@param commandExecutionHandler New execution handler
@return new builder instance using the command execution handler
cloud-core/src/main/java/org/incendo/cloud/Command.java