db.collection.ensureIndexes() method does not have "safe" option

Correct me if I'm wrong here, but documentation doesn't state that the "safe" option exists:

http://docs.mongodb.org/manual/reference/method/db.collection.ensureIndex/
http://docs.mongodb.org/v2.2/reference/method/db.collection.ensureIndex/

Was there a reason for this before I go crazy with minor fixes like this?