BulkIndex claims to upsert but doesn't

[unthingable]

src/Database/Bloodhound/Types.hs:

{-| 'BulkOperation' is a sum type for expressing the four kinds of bulk
    operation index, create, delete, and update. 'BulkIndex' behaves like an
    "upsert", 'BulkCreate' will fail if a document already exists at the DocId.

Nope, BulkIndex behaves like an "index".