Return searched documents with no matches

[adriangb]

I'm interested in using Quickwit as an index for an existing system.
One complexity of a system like this is consistency: especially since Quickwit does async commits it's possible that a document is logically present in the system but absent from Quickwit search results.

Would it be have some way for the /search and/or /search/stream APIs to return a notion of which documents were scanned?
That way if I get back matches for documents 1, 2 & 3 and a scan but no matches for document 4 I'm sure I can exclude document 4 from my query. Otherwise I don't know if I got no results for document 4 because it didn't match the query or because it isn't available for search in Quickwit yet.

Obviously it can't just return every document that didn't match, something like two searches is needed.

The most obvious solution I can think of is something like:

1. Perform the actual search e.g. indexed_table:123 AND message:abc
2. Do a followup search with only indexed_table:123
3. Take the difference, anything in search (2) that is not in search (1) is present in Quickwit but didn't match the search term.