ArchetypeChunk.StartIndex doesn't exist?

I need this exact functionality, but I don't see StartIndex in my chunks. This is from the docs:

Code (CSharp):

1. struct CollectValues : IJobParallelFor
2. {
3.     [ReadOnly] public NativeArray<ArchetypeChunk> chunks;
4.     [ReadOnly] public ArchetypeChunkComponentType<EcsTestData> ecsTestData;
5.  
6.     [NativeDisableParallelForRestriction] public NativeArray<int> values;
7.  
8.     public void Execute(int chunkIndex)
9.     {
10.         var chunk = chunks[chunkIndex];
11.         var chunkStartIndex = chunk.StartIndex;
12.         var chunkCount = chunk.Count;
13.         var chunkEcsTestData = chunk.GetNativeSlice(ecsTestData);
14.  
15.         for (int i = 0; i < chunkCount; i++)
16.         {
17.             values[chunkStartIndex + i] = chunkEcsTestData[i].value;
18.         }
19.     }
20. }

 

It has long been removed

 

What's the alternative?

 

IJobChunk

 

Thanks. IJobChunk is pretty nice.