public String getMasterUserARN() {
        return this.masterUserARN;
    }
<p>
Amazon Resource Name (ARN) for the master user. Only specify if <code>InternalUserDatabaseEnabled</code> is
<code>false</code>.
</p>

@return Amazon Resource Name (ARN) for the master user. Only specify if <code>InternalUserDatabaseEnabled</code>
        is <code>false</code>.
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/MasterUserOptions.java