What's a common approach for keeping the index up to date? A live ETL from the DB to the search engine doesn't sound simple. Another method I can think of, afte

What's a common approach for keeping the index up to date? A live ETL from the DB to the search engine doesn't sound simple. Another method I can think of, after existent data has been loaded, is to send the data directly at the same time to both the database and the search engine every time a user makes a CRUD operation but lots of works too if you don't already have a HTTP api and are doing mostly server-side-rendered HTML.