public static <KIn, VIn> FixedKeyRecord<KIn, VIn> create(final Record<KIn, VIn> record) {
        return new FixedKeyRecord<>(
            record.key(),
            record.value(),
            record.timestamp(),
            record.headers()
        );
    }
Only allowed way to create {@link FixedKeyRecord}s.
<p/>
DO NOT USE THIS FACTORY OUTSIDE THE FRAMEWORK.
This could produce undesired results by not partitioning record properly.

@see FixedKeyProcessor
streams/src/main/java/org/apache/kafka/streams/processor/api/InternalFixedKeyRecordFactory.java