Use elastic search inside big database

Following this link, I have decided to index all the information in elasticsearch in addition to the main database of the site, and then the information displayed to the users of the site will be taken from Elasticsearch, such as displaying the latest news and searching among hundreds of thousands of news... Is this The method is correct and can I show thousands of pages following a search like Earth, I know it is possible but why is it not good in this link recommendations.html#large-size

Closed as duplicate.