OperationKind

What kind of work an Operation is. Open: one value per kind of work, added as kinds are modelled.

A string. The SDKs keep a value they do not know yet as the string itself (Python: an unknown member carrying it), so a newer server never breaks an older SDK.

Value	Description
document_ingestion	A document's ingestion: reading, enriching and indexing its content.

Used by CreateDocument.