No filename in the answers

[anthropoy]

I have followed through the tutorial Build a Scalable Question Answering System. In the answers, I want to display the filename of where the answers were from but the answer object doesn't contain any meta data about the filename.

I tried using a ready-made pipeilne DocumentSearchPipeline as shown in https://docs.haystack.deepset.ai/docs/ready_made_pipelines. It's the same, still no filename meta.

Anyone please help?