Depending on what version of Elasticsearch is used, you can decide to install either the shield(less than 5.x) plugin or x-pack(paid subscription with a free trial period).

With x-pack installed, if you want to manage Roles in Kibana,

1. Login to Kibana
2. Navigate to Management -> Roles.
3. click on +Create role
4. Provide a name to your role
5. In the index privileges section, provide the index name and privileges required (read, write etc.)
6. save

With shield, you can manage roles using this document.