I have a lightning component where I am using force:lightningField for the lookup field on a quick action created through a lightning component. I need to reset the this field on the quick action the submit button is hit.
    <force:inputField value="{!v.Contact.AccountId}" aura:Id="lookup"/>


By setting the field to null or blank, it is not working. Can anyone please help me here with any ideas as how I can reset the field