Unclear how to make a secondary index on another model about docs HOT 2 CLOSED

type Project @model {
  id: ID!
  name: String
  teamID: ID @index
  team: Team @hasOne(fields: ["teamID"])
}

type Team @model {
  id: ID!
  name: String!
}

type Booking @model 
@auth(rules: [{allow: private, operations: [read, update]}, {allow: groups, groups: ["tutors"], operations: [read, create, update, delete]}, {allow: groups, groups: ["admins"], operations: [read, create, update, delete]}]) 
{
  id: ID!
  startDateTime: AWSDateTime!
  duration: Int!
bookingTutorId ID! @index
  Tutor: Tutor! @hasOne(fields: ["bookingTutorId"])
  bookingCode: String!
  amount: Float!
  discount: Float!
  clientNotes: String
  tutorNotes: String
  tutorPaid: Boolean!
  clientPaid: Boolean!
  resources: String
bookingClientId ID! @index
  Client: Client @hasOne(fields: ["bookingClientId"])
  studentName: String
  tutorRating: Int
  clientRating: Int
  bookingType: String
  tutorPayAmount: Float
  tip: Float
  transactionId: String
  tutorMileage: Float
  meetingUrl: AWSURL
  hwFiles: [String]
  resourceFiles: [String]
  meetingInstructions: String
  sessionTaught: Boolean
}