ELK - How to provide permission to individual user on particular index

Elastic Stack Elasticsearch
1

I have few index in my cluster
index_2019-01-01
index_2019-01-02
index_2019-01-03
index_2019-01-04
index_2019-01-05
index_2019-01-06

There are two user USER1 & USER2
USER1 has full right to this index pattern.
I want to provide access rigths to USER2 for first three index

How can I achieve this in ELK

Elastic version 7.2

2

Our getting started guide is here:

The section titled "Assign Roles" covers how to create roles and assign them to users.

If you have specific questions, or if there's something unclear in there, please ask.