How reliable is Elasticsearch for Highload? How to implement horizontal scale?

Question

Highload

The amount of data is small, sharding is not required.
We plan to use elastic as a search by filters\fulltext.
Requires scalable "on the fly" replication, we plan to use Amazon EC2 as a platform.
The data in the elastic will be constantly updated, it is necessary that the replicas pick up (but not necessarily immediately) the necessary data.
What are the pitfalls?

Answer 1

Replication is convenient. When using it, I ran into two problems - 1) range filter by numbers is slower than full-text search, this surprised me a lot 2) the index crashed a couple of times after elastic was restarted.

Answer 2

no resources other than zhora,
select the right options in Amazon - in the cheapest option with a crash there are no logs, it will be difficult to determine whether it is elastic or not

Answer 3

it's all out of the box it has and works
it's not clear what the question is