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Hi, I'm trying to set expiration date on field in my database with kmongo-coroutine driver. My goal is when date is expired whole entry should be removed rom mongo db. But idk how to make it work.
```override suspend fun setTokenInvalid(refreshToken: String):Boolean {
    collection.createIndex(RefreshToken::refreshToken, IndexOptions().expireAfter(7, TimeUnit.DAYS))

}```


I've found solution but in my opinion there is a better solution without using string.
```collection.createIndex(
    " { expiresAt : 1 } ",
    IndexOptions().expireAfter(60, TimeUnit.SECONDS)
)```
