@Override
    public void flush() throws IOException {
        // We ignore flush to the file as the stream store does not allow it for
        // performance reasons.

        // We only flush to our buffer (not all the way to the file)
        if (currentStreamBuffer != null) {
            currentStreamBuffer.flush();
        }
    }
Start a new burst of GZIP Block Content (with a marker).
stroom-data/stroom-data-store-impl-fs/src/main/java/stroom/data/store/impl/fs/BlockGZIPOutputFile.java