fastest way to find product in shop by keywords json

What is the fastest way to find products in Shopify by keywords? I tried getting all the product lists from collections with JSON file but it takes some time, and I know you can do this way faster. I am using Golang. Maybe do you have any suggestions? maybe use a search engine that is given on the website? For example, I put 5 keywords of product and I need to get a link from this product. I already did this, but my code checks all collections and all products while finding the exact product. And it takes minutes to do so.