204 No Content. Send no body. extraction_id is the id of an entry of results.extractions in Get run. Values you corrected with Edit field stay as they are.
This closes the review loop: read the results, correct the fields and rows, then verify. On a dataset document, the verified extraction also becomes the document’s ground truth, so its workflow accumulates accuracy.
An extraction with no fields, such as the main extraction of a split run, answers 204 and verifies nothing. Verify the extractions of its splits.
A document with an assigned verifier refuses every other user with 403 NOT_ASSIGNED_VERIFIER. The key acts as its owner.