Store prices in Elasticsearch using search-a-licious

[raphael0202]

It would unlock many things, including advanced search with complex lucene query.

We would use a flat schema, with the following fields:

• labels (from product or from price)
• barcode
• categories (from product or from price)
• brands
• location (lat/long, country, city, shop name, shop type)
• proof (type, owner, currency, date)
• price
• currency
• is_discounted
• discounted price
• without_barcode
• origin (only for barcodeless prices)
• price_per
• nutriscore
• nova_score
• ecoscore
• flavor
• date