How to dynamically update searchParameters?

I want to update the SearchParameter restrictSearchableAttributes according to a user selection in a dropdown next to the search box.

Updating search.searchParameters like search.restrictSearchableAttributes = 'mynumbers' does not work.

How can I set searchParameters after the initial setup:

var search = instantsearch({
    ...
    searchParameters: {
        restrictSearchableAttributes: 'text',
    }
})

$('#x').on('click', function() {
    // How to update "restrictSearchableAttributes" here (and start a new search)?
    // ?

    // This does NOT work:
    search.restrictSearchableAttributes = 'mynumbers';
    search.start();
})

[vvo]

You would have to build your own custom widget:

var customWidget = {
  init: function(options) {
    $('x').onClick(function() {
      options.helper.setQueryParameter('restrictSearchableAttributes', ...);
    });
  }
};

search.addWidget(customWidget);

Let me know.

[powtac]

options.helper.search(); did the job! Thanks for your help, @vvo! I’ll come back to your offer and contact you via the support forms later this week.