[DOCUMENTATION] Missing Documentation for SSL Keystore keyPassword Settings

[itsmevichu]

The following security plugin settings are not documented:

• plugins.security.ssl.transport.keystore_keypassword
• plugins.security.ssl.http.keystore_keypassword

Please consider adding them to the official documentation

[cwperks]

[Triage] Thank you for filing this issue. @willyborankin to take a look to see where documentation can be updated for these settings.