Apologies if this is obvious

Is it possible to do autocomplete with more than one field

This example shows it with one field as a source which I've got working

http://find.episerver.com/Documentation/searching-with-javascript-autocomplete

I can see that the post data fields is an array but what about the wildcard and the output for the success filed. This is what we are doing currently for one field

    //.. episerver find search
        $(searchBoxSelector).autocomplete({
            source: function (request, response) {
                var wildcard = { "ProductName$$string.lowercase": "*" + request.term + "*" };
                var postData = {
                    "query": { "wildcard": wildcard },
                    "fields": ["ProductName$$string"],
                    "size": 5
                };
                $.ajax({
                    url: autocompleteUrl,
                    data: JSON.stringify(postData),
                    dataType: 'json',
                    type: 'POST',
                    success: function (data) {
                        response($.map(data.hits.hits, function (item) {
                            return {
                                label: item.fields.ProductName$$string,
                                value: item.fields.ProductName$$string
                            };
                        }));
                    }
                });
            }};

Thanks