CloudKit: Query the index ( recordID.recordName )

I'm trying to figure out how to query the index of my records in cloudkit using Objective-C. I build a query to fetch all my records:

CKContainer *container = [CKContainer containerWithIdentifier:containerID];
CKDatabase *publicDatabase = [container publicCloudDatabase];
CKQuery *query = [[CKQuery alloc] initWithRecordType:recordType
                                           predicate:[NSPredicate predicateWithFormat:@"TRUEPREDICATE"]];
[publicDatabase performQuery:query
                inZoneWithID:nil
           completionHandler:^(NSArray *results, NSError *error)
 {

     if (!error)
     {
     NSLog(@"results query %@", results);

     }

     else
     {
         NSLog(@"FETCH ERROR: %@", error);
     }
 }];

But I need to get the index of each record. Any of you knows how can only query the index of all records?

I'll really appreciate your help