Searching for same value across multiple fields

The multi_match query is used to match the same value across multiple fields. When a user searches for biking jacket, searching just the product_name field might not find any matches. To widen the search, we should most probably also search the description field along with the product_name field. The document that contains both biking and jacket is shown here:

 {
   "product_name": "Men's Water Resistant Jacket",
   "description": "Provides comfort during biking and hiking",
   "unit_price": 69.99,
   "reviews": 5,
   "release_date": "2017-03-02"
 }

Scoring based on a single field is pretty straightforward, scoring based on multiple fields gets tricky. We can't use a match query with an operator as the terms biking and jacket don't exist in...