Hello Shyam,
The Digicert SSL information can be found here:
Regarding the LDAP configuration, here you will find information about how to achieve depending if you are using Open Distro or Open Search:
For example, on Okta these are the steps to need to complete to configure LDAP:
1- Create an account in Okta. Request a free trial if you don't have a paid license.
2- Create a new user. This step can be skipped if you are just testing, you can use your Okta admin user for the example.
3- Create a new group.
4- Add the new user to the new group.
5- Create a new app. Configure the SAML settings while you create the app.
6- Add the new app to the new group.
7- Note the necessary parameters from the new app's SAML settings.
8- Configure Open Distro security configuration files.
9- Run the Open Distro security admin script to apply the changes made to the configuration files.
10- Configure the Kibana configuration file.
11- Restart Kibana.
12- Test the configuration.
Let me know if that information was useful to you.