docs: public boolean isEnabledSaslMechanism(String saslMechanism) {
          // If enabledSaslMechanisms is not set, then all mechanisms which are not blacklisted are enabled per default.
          if (enabledSaslMechanisms == null) {
              return !SASLAuthentication.getBlacklistedSASLMechanisms().contains(saslMechanism);
          }
          return enabledSaslMechanisms.contains(saslMechanism);
      }