Mongodb Index Creation Problem

  mongodb, question

For example, the collection test has the following document format

 "_id" : ObjectId("123456"),
 "name" : "test",
 "body" : [
 "hash" : "123123123"

At this time, if you want to create an index for the hash key, how should you create it? the value of body is an array, so it’s a bit confusing.

db.test.createIndex({"body.hash": 1})