@Override
        public void putLatestValue(final Bytes key, final byte[] value) {
            // all writes go to write buffer
            latestValueWriteBuffer.put(key, Optional.ofNullable(value));
        }
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