@Override
        public long offset() {
            return buffer.getLong(OFFSET_OFFSET);
        }
Get an iterator for the nested entries contained within this batch. Note that
if the batch is not compressed, then this method will return an iterator over the
shallow record only (i.e. this object).
@return An iterator over the records contained within this batch
clients/src/main/java/org/apache/kafka/common/record/AbstractLegacyRecordBatch.java