docs: void remove(String absolutePath) {
        if (absolutePath == null)
           return;
        GridFile.Metadata md = metadata.get(absolutePath);
        if (md == null)
           return;
  
        int numChunks = md.getLength() / md.getChunkSize() + 1;
        for (int i = 0; i < numChunks; i++)
           data.remove(FileChunkMapper.getChunkKey(absolutePath, i));
     }