GridFSInputFile input = documentfs.createFile(df.getStream(), df.getFileName());
input.put(DOCUMENT_KEY, df.getDocumentId().getID());
input.put(ENCODING_KEY, df.getEncoding());
input.put(MIMETYPE_KEY, df.getMimetype());
input.save();
/**
* This is here because of random failures when trying to do this query from another thread.
*
* RemotePipelineTest.testSaveFile() failed 2 or 3 times out of 100.