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You need to read and follow that guide that you linked. It gives very explicit instructions:

In a development environment (do not use this in production), you can use they they keytool command to create a self-signed certificate and add it to a keystore for use with a server running on localhost:

keytool -genkey -alias server-alias -keyalg RSA \ -storepass changeme -keypass changeme -keystore keystore.jks \ -dname 'CN=localhost, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown'

Note that the values used in -keypass changeme and -storepass changeme correspond directly to the values that must be set for ent_search.ssl.keystore.key_password and ent_search.ssl.keystore.password, respectively.

If you're not familiar with the terminology, you may first want to read up on SSL/TLS, Certificates/Keys, and Certificate Authorities: