operator fun <T> MongoIterable<T>.plus(element: T): List<T>operator fun <T> MongoIterable<T>.plus(elements: Array<out T>): List<T>operator fun <T> MongoIterable<T>.plus(elements: Iterable<T>): List<T>operator fun <T> MongoIterable<T>.plus(elements: Sequence<T>): List<T>