In views filter I have added user reference field and its showing me as select drop-down.I have exposed that field in the filter.

Those user reference fields are related to a content type.

But I want those to be as auto-complete field instead of drop-down, just as taxonomy fields has drop-down or auto-complete option.

The issue with select list is that there are thousands of users in that list and its taking time to load all values and render the page. To avoid that issue trying to change from select widget to auto-complete widget.

How can I achieve this ? any help will be appreciated. Thanks in advance.