Use the new ElasticSearch endpoint to provide as you type brand suggestions

[teolemon]

What

• Use the new ElasticSearch endpoint to provide as you type brand suggestions
• deployment at https://search.openfoodfacts.org/
• https://search.openfoodfacts.org/docs

Where

Related web/dart feature

• Use open-food-facts-search to provide brand suggestions openfoodfacts-server#7794
• Use the new ElasticSearch endpoint to provide as you type brand suggestions openfoodfacts-dart#619

Part of

• 🎯 What can I work on ? #37

[teolemon]

@alexfauquette @VaiTon this one would be very useful, now that we have a stable endpoint for brands predictions (we've started using it in the app, and we should bring it to the web as well)