[elastic] Added documentation missing description of required user roles permissions (#12498)
[elastic] Added documentation missing description of required user roles permissions (#12498)

* Added Eslasticsearch role and user permissions doc

* Added links to elasticsearch doc

* Update elastic/README.md

Co-authored-by: Bryce Eadie <b63523e961b8bcb679317b02d0d403d58c841027@datadoghq.com>

* Update elastic/README.md

Co-authored-by: Bryce Eadie <b63523e961b8bcb679317b02d0d403d58c841027@datadoghq.com>

* Update elastic/README.md

Co-authored-by: Bryce Eadie <b63523e961b8bcb679317b02d0d403d58c841027@datadoghq.com>

* Move the new links to the bottom with the other reference links

Co-authored-by: Bryce Eadie <b63523e961b8bcb679317b02d0d403d58c841027@datadoghq.com>
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core