public Function<? super EventLoopGroup, ? extends EventLoopScheduler> eventLoopSchedulerFactory() {
        return get(EVENT_LOOP_SCHEDULER_FACTORY);
    }
Returns the factory that creates an {@link EventLoopScheduler} which is responsible for assigning an
{@link EventLoop} to handle a connection to the specified {@link Endpoint}.
core/src/main/java/com/linecorp/armeria/client/ClientFactoryOptions.java