nested ng-repeat $parent.$index and $index

DEMO FIDDLE

That’s because the directive ng-if creates a new scope for itself, when you refer to $parent, it access the immediate $parent‘s scope, i.e., the inner repeat expression’s scope.

So if you want to achieve something you wanted like in the former, you may use this:

<div ng-repeat="i in list">
    <div ng-repeat="j in list2">
        <div ng-if="1">
            ({{$parent.$parent.$index}} {{$parent.$index}})
        </div>
    </div>
</div>

if you have more than one inner directives, you can use ng-init for storing $index in a variable for references in child scopes.

<div ng-repeat="i in list" ng-init="outerIndex=$index">
    <div ng-repeat="j in list2" ng-init="innerIndex=$index">
        <div ng-if="1">
            ({{outerIndex}} {{innerIndex}})
        </div>
    </div>
</div>

I strongly suggest you to go through this article on understanding scopes in angular