var conn = new Mongo();
var db = conn.getDB('eba');
var products = db.products.find();

function mkNewFormat(p) {
    return {
        _id: p._id,
        name: p.name,
        imgUrl: p.imgUrl,
        thumbUrl: p.thumbUrl,
        size: p.size,
        ES: {
            text: p.description.text.ES,
            category: {
                _id: p.category._id,
                name: p.category.name.ES
            }
        }, 
        EN: {
            category: {
                _id: p.category._id,
                name: p.category.name.EN
            }
        }
    }
}

products.forEach(function (p) {
    db.products.update({_id: p._id}, mkNewFormat(p))
})