mongoc_bulkwrite_updateoneopts_set_upsert

void
mongoc_bulkwrite_updateoneopts_set_upsert (mongoc_bulkwrite_updateoneopts_t *self, bool upsert);

If upsert is true, creates a new document if no document matches the query.

The upsert option is not sent if this function is not called. The server's default value is false.

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