OptionalapiOptionalignoreOptionallimitOptionalmetadataOptionalonlySkip every Anfrage the corpus holds with all its documents, without a request for it; what is missing, or stored without a document, is handled.
OptionalperiodOptionalrefsHandle only these references of the window, and the ones they were filed under
before (DocRef.formerly). With retryFailed too, either one selects.
OptionalretryHandle only the Anfragen whose last attempt failed (SourceState.failed).
OptionalsampleHEAD requests at most for the size estimate (default DRY_RUN_SAMPLE); 0 asks none.
OptionalsinceRead only: records, blobs and source state. Nothing is written.
Optionaluntil
The part of the sync options that says what a job covers: the window discovery looks at, and which of the Anfragen it finds are handled (issue #27).