We're considering storing Ad hoc Canvas cards as page attachments, but would like the card's content to be indexed nicely.

So here's an scenario:

• I create a board on a page
• In the board, I add a few cards, containing the value 'cheese', and 'bacon'.
• The cards are saved as the page's attachment
• If search for 'cheese', I don't get a hit, because the attachment is not extracted/index

So, if there's already in core-confluence a 'PDF' extractor, it would be great if there was a JSON extractor:

• If an attachment extension is .json then parse it
• Traverse it to extract all the values (as plain string tokens)
• Nice to have: to handle key-pairs and indexed them as such given a pattern. For example if in the attachment I have an attribute cheese: "Bacon" it be great if I could search for "cheese:"Bacon") and get a hit.