jnunemaker/mongomapper — comment on commit 4529a72c0e7bc0b8c4d917ccaa4dea5fdbb902b3
File: lib/mongo_mapper/railtie/database.rake line 60
By bkeepers:

I don't think there are any docs yet, but it should just contain calls to Model.ensure_index (http://mongomapper.com/documentation/plugins/indexes.html)