@Override
    public SaslAuthenticateRequestData data() {
        return data;
    }
Request from SASL client containing client SASL authentication token as defined by the
SASL protocol for the configured SASL mechanism.
<p/>
For interoperability with versions prior to Kafka 1.0.0, this request is used only with broker
version 1.0.0 and higher that support SaslHandshake request v1. Clients connecting to older
brokers will send SaslHandshake request v0 followed by SASL tokens without the Kafka request headers.
clients/src/main/java/org/apache/kafka/common/requests/SaslAuthenticateRequest.java