public RecordValidationStats recordConversionStats() {
        return recordValidationStats;
    }
Encapsulation for {@link RecordsSend} for {@link LazyDownConversionRecords}. Records are down-converted in batches and
on-demand when {@link #writeTo} method is called.
clients/src/main/java/org/apache/kafka/common/record/LazyDownConversionRecordsSend.java