Upgrade from 6.8 to 7.2 fails with "unknown secure setting" message

Hi,
I have upgraded from v6.8 to v7.2 and everything seemed ok but when I tried to start my single instance, I faced these messages:

[2019-07-04T18:18:30,188][ERROR][o.e.b.Bootstrap          ] [saelklab1.crifnet.com] Exception
java.lang.IllegalArgumentException: unknown secure setting [xpack.ssl.truststore.secure_password] did you mean any of [xpack.http.ssl.truststore.secure_password, reindex.ssl.truststore.secure_password, xpack.http.ssl.keystore.secure_password, xpack.security.http.ssl.truststore.secure_password]?

Suppressed: java.lang.IllegalArgumentException: unknown secure setting [xpack.ssl.keystore.secure_password] did you mean any of [xpack.http.ssl.keystore.secure_password, reindex.ssl.keystore.secure_password, xpack.http.ssl.keystore.secure_key_password, xpack.http.ssl.truststore.secure_password, reindex.ssl.keystore.secure_key_password, xpack.http.ssl.keystore.key_password, xpack.security.http.ssl.keystore.secure_password]?

I'm not understanding this issue since I have not configured those keys into my elasticsearch.yml
Furthermore, I'm not finding any files where they are located.

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