Where is the "auto submit" option?
While tracking the above issue is good for long-term success... if you need this functionality ASAP, here's a tiny bit of a hack to get it working with some custom javascript. Inside your theme's JS, add something like the following:

// Autosubmit 'view-class-here' views exposed form.
$("div.view-class-here").find("form.views-exposed-form").find("select").bind("change", function () {
  $(this).closest("form").trigger("submit");
}).end().find("input[type='submit']").addClass("visually-hidden");


This will do the following:


Look at any select item in a given views exposed form (for a view with a class .view-class-here), and trigger a submit whenever the select list is changed.
Hide the 'Submit'/'Apply' button associated with the exposed form.


If you want to trigger the submit on input fields, change the .bind() to use something like input:checkbox or input for any kind of input (though that might need more tweaking to make sure things don't go crazy!).