What is the equivalent of creating MySQL indexes in Elasticsearch?

Elastic Stack Elasticsearch
1

Hello!

As you probably know, in MySQL you can create indexes to improve the performance of your queries. Is there any such equivalent in Elastic? I have gone through the entire documentation, and I'm pretty sure there is no such thing. (I already know that an index is somewhat the equivalent of creating a database in Elastic)

I just need confirmation from some black belt Elastic users :wink:

2

Elastic creates indices for all fields by default.
Don't worry :slight_smile:

3

Yes, I know there's a default template for this. But my question is, performance-wise, is there any such thing as creating an index to improve performance just like in MySQL?

4

Elasticsearch IS an index. So your question does not really make sense or I don't get it.

You don't have to create an index on an index...

5

Kind of? By default all the fields are indexed so that isn't a thing you have to do. You can actually turn off indexing if you want to save space. Unlike MySQL there isn't a convenient way to fall back to a table scan if you don't have an index. A script query is sort of like asking for a table scan but you have to use it explicitly.

As far as things you can tune, I can only think of precision_step which lets you trade index size for speed. Geo has similar things, iirc.

If you want to learn more, go read the mapping docs.