I implemented this as well successfully. Re structured data i transformed it from JSON into more "natural language". Also ended up using MiniLM-L6-v2. Will post GitHub link when i have packaged it independently (currently in main app code, want to extract into independent micro-service)

You wrote:

>A search for “review configuration” matches every JSON file with a review key.

Its good point, not sure how to de-rank the keys or to encode the "commonness" of those words