Using an unspecified index. Consider adding ".indexOn": "g"

Question

I'm using Geofire to do a circleQuery in a certain area. With my observers set up I am getting back locations, however, with the location I also get back a "Using an unspecified index. Consider adding ".indexOn": "g""

My db for my geofire looks like this karmadots/geofire/{events}

"rules": {
  "karmadots": {
    ".read": true,
    ".write": true, 
    "geofire": {
      "$events": {
        ".indexOn": ["g"]
      }
    }   
  }

I've also tried:

"rules": {
  "karmadots": {
    ".read": true,
    ".write": true,
    "geofire": {
      ".indexOn": ["g"]
    } 
  }
}

Both don't make the message go away. Is there something else I can try reading or try as an example?

Thanks for the help.

EDIT:

My path is xxxxx.firebaseio.com/karmadots/geofire/{keys}

This is how I query:

func setupListeners(query: GFQuery){

    // Event is in initial area or entered area
    query.observeEventType(GFEventTypeKeyEntered, withBlock: { (key: String!, location: CLLocation!) in
        println("Key '\(key)' entered the search area and is at location '\(location)'\n")
    })

    // Event left area
    query.observeEventType(GFEventTypeKeyExited, withBlock: { (key: String!, location: CLLocation!) in
        println("Key '\(key)' left the search area\n")
    })

    // Event moved but is still in area
    query.observeEventType(GFEventTypeKeyMoved, withBlock: { (key: String!, location: CLLocation!) in
        println("Key '\(key)' moved in the search area and is at location '\(location)'\n")
    })

}

Answer 1

Removing the brackets around ["g"] fixes the problem. Here is the final piece of code:

"rules": {
  "karmadots": {
    ".read": true,
    ".write": true,
    "geofire": {
      ".indexOn": "g"
    } 
  }
}