[FEATURE] Make changing the admin password easy

[dblock]

Is your feature request related to a problem?

Changing the admin password in OpenSearch is too hard.

https://code.dblock.org/2023/08/08/changing-the-default-admin-password-in-opensearch.html

What solution would you like? An API/tool that lets me change the admin password.

What alternatives have you considered? Do nothing.

Do you have any additional context? Coming from https://code.dblock.org/2023/08/08/changing-the-default-admin-password-in-opensearch.html

[peternied]

[Triage] This is a good feature request - this would be a good area to improve.