private void saveBitmap(ByteBuffer bitmapMemory, boolean isFlush) throws IOException {
        bitmapMemory.clear();
        if (bitmapBuffer.remaining() >= bitmapMemory.capacity()) {
            bitmapBuffer.put(bitmapMemory);
        } else {
            bitmapBuffer.flip();
            bitmapFile.write(bitmapBuffer);

            bitmapBuffer.clear();
            bitmapBuffer.put(bitmapMemory);
        }
        if (isFlush) {
            bitmapBuffer.flip();
            bitmapFile.write(bitmapBuffer);
            bitmapBuffer.clear();
        }
    }
Delete all files generated by this class.
indexr-vlt-segment/src/main/java/io/indexr/vlt/segment/index/DictMerge.java