inline fun <T, R : Any> MongoIterable<T>.mapIndexedNotNull(crossinline transform: (index: Int, T) -> R?): List<R> (source)
Returns a list containing only the non-null results of applying the given transform function to each element and its index in the original collection.
transform - function that takes the index of an element and the element itself
and returns the result of the transform applied to the element.