index without preview feature

Howdy, I have a user model that I frequently search on with where {}. I wanted to improve performance and read about indices with postgresql. I found that this is a preview feature on the docs, but my handy AI assistant claims I can just do this:

model User {
  id        Int      @id @default(autoincrement())
  firstName String
  lastName  String
  // ... other fields ...

  @@index([firstName])
  @@index([lastName])
}

model User {
  id        Int      @id @default(autoincrement())
  firstName String
  lastName  String
  // ... other fields ...

  @@index([firstName])
  @@index([lastName])
}

model User {
  id        Int      @id @default(autoincrement())
  firstName String
  lastName  String
  // ... other fields ...

  @@index([firstName])
  @@index([lastName])
}

model User {
  id        Int      @id @default(autoincrement())
  firstName String
  lastName  String
  // ... other fields ...

  @@index([firstName])
  @@index([lastName])
}

Does this work out of the box? Will this create an index for those fields in my postgres db and improve performance?

Appreciate the help, folks!

index without preview feature

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