[MongoDB] 다양한 인덱스

{_id : 1, tags : ["mongodb", "nosql", "index"]}
{_id : 2 , tages : ["database", "index"]}

db.users.createindex({tags : 1})

"database" -> _id : 2
"index" : -> _id : 1, _id : 2
"mongodb" -> _id : 1
"nosql" -> _id : 1

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db.users.createIndex({"creatdAt"}, {expireAfterSeconds : 3600})

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db.users.createindex({title : "text", content : "text"})
-> db.users.find({$text : {$search : "mongodb index"})