I everyone i have my SearchBar running to find by title but i want him to find or title or category how can i do it ? and is possible to implement the autocomplete ?

router.get('/', async (req, res) => {

if (req.query.search) {
    const regex = new RegExp(escapeRegex(req.query.search), 'gi');

    const books = await Book.find({ title: regex });
    res.render('books/home', { books: books, user: req.user });






} else {
    const books = await Book.find({});
    res.render('books/home', { books: books, user: req.user});
}

});