Waht I would like to show in Bargraph (or Pie) is how many servers have X number of IDs reporting. IDs are not reporting every timestamp. IDs are unique Hash Valiues in Real.
The number of servers is about 1000.
Result should be
1 Server with 3 IDs (Server 1)
1 Server with 2 IDs (Server 3)
2 Servers with 1 IDs (Server 2 and 4)
So I should be able to stack Unique Count on top of Unique Count.
Now you can create a visualization based on this "view" of your data to get what you want: Splitting the pie slices by terms of ID_cardinality and using a "Count" aggregation for the size of the slices.
Creating this kind of transformed view can also be helpful for other insights - you can also set the transform job up to continuously add incoming data the view to keep it up to date.
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