public MasterUserOptions getMasterUserOptions() {
        return this.masterUserOptions;
    }
<p>
Credentials for the master user: username and password, ARN, or both.
</p>

@return Credentials for the master user: username and password, ARN, or both.
aws-java-sdk-elasticsearch/src/main/java/com/amazonaws/services/elasticsearch/model/AdvancedSecurityOptionsInput.java