Elasticsearch + mongodb, is mongodb needed?

Question

NoSQL

Are there any reasons why Elasticsearch + mongodb still makes sense today,
why not switch completely to Elasticsearch as a nosql database?

Answer 1

Do you understand that these two DBMSs have somewhat different purposes and are generally relatively different ?
Usually, however, such things are used only for indexing, and the benefit of specifically elastic search is that the index is maintained in real time.

Answer 2

Probably because you cannot send some requests to such a database?
If, of course, everything is limited to three simple queries, then of course you can go.