[BUG][opensearch]

[tibz7]

Describe the bug
running the playbook fails because user logstash password is not defined.

To Reproduce
Steps to reproduce the behavior:

1. Run the playbook with the given example in the readme
2. Delete the logstash user and run the playbook,
3. It works.

Expected behavior
Playbook work out of the box, providing only the admin and kibanaserver password in the --extra-vars
Maybe it is just the documentation which was not very clear to me, but that case, the logstash user should be provided as well, as part of the example.

[prudhvigodithi]

[Triage]
Hey @tibz7 thats for bringing this up, I do see there is a way to change the admin user directly during the install, similar way we should add for logstash user, can you please contribute with the fix?
Thank you
@gaiksaya @bbarani @peterzhuamazon

[bbarani]

@tibz7 Can you confirm if this PR has addressed this documentation gap?