According to the API documentation at https://developers.google.com/books/docs/v1/reference/volumes/list, you can "Restrict information returned to a set of selected fields." using the projection parameter. So the call might look something like
client.books.volumes.list({ q: query, projection: 'lite' }).withAuthClient(oauth2Client);
Although the documentation doesn't say so, it does look like you can also use the "fields" parameter to specify exactly which fields you want. Use the field editor as part of the "Try it!" block on that page to get the exact configuration you want, but something like this should also work to get just the book ID, the title, and authors:
client.books.volumes.list({ q: query, fields: 'items(id,volumeInfo(authors,title))' }).withAuthClient(oauth2Client);