Mongoose/MongoDB 如何做不区分大小写的唯一索引？类似MySQL的 utf8_general_ci

可以使用text search :)

If the index language is English, text indexes are case-insensitive for non-diacritics; i.e. case insensitive for [A-z].

链接：http://docs.mongodb.org/manual/core/index-text/