@Override
        public byte[] getLatestValue(final Bytes key) {
            final Optional<byte[]> bufferValue = latestValueWriteBuffer.get(key);
            if (bufferValue != null) {
                return bufferValue.orElse(null);
            }
            return dbClient.getLatestValue(key);
        }
Client for writing to (and reading from) the write buffer as part of restore.
streams/src/main/java/org/apache/kafka/streams/state/internals/RocksDBVersionedStoreRestoreWriteBuffer.java