[DOC]Link keystore and truststore files documentation with related securityadmin script documentation

[cwillum]

What do you want to do?
Before updating the Security plugin with configured keystore and truststore files using the securityadmin script, a user should be made aware of the actual keystore and truststore file settings that configure their location and passwords. These separate pages of documentation should be linked to facilitate the process.

When making these updates, it's probably a good idea to look into whether the upcoming Authorization in REST layer feature will have an impact on the current information and guidance.

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request.

Link these two sources of information and check whether the current information needs to be updated.

What other resources are available?

Authorization in the REST layer

[cwillum]

@seashman @kolchfa-aws Feel free to revise or add supporting information to the description of this issue.

[seashman]

It looks like keystore CLI ommands work about the same as the elasticsearch-keystore: https://www.elastic.co/guide/en/elasticsearch/reference/current/elasticsearch-keystore.html. It would be good to include how to use the keystore CLI to add credentials for plugins.

[AntonEliatra]

@hdhalter I'll pick this one up