[4.0.1] How to set the search input box's placeholder?

[livem]

Hi , I want to set some tips in dropdown search input box with input tag attributes placeholder ,

what look like blew:

the select2 option placeholder is not for this.

{ placeholder:'......' }

Now I do this with select2:open event :

$("select").on("select2:open", function(event) {
    $('input.select2-search__field').attr('placeholder', 'please type something...');
});

Is there some new option for this in the next version?

Thanks.

[kevin-brown]

This is a duplicate of #3362.

The old option was not migrated to 4.0.0.