Eventstats Question/Bug

I notice that sometimes eventstats loads more data than the event results produce.

For example lets say I have a search on field id that produces 5 results which I then pass to eventstats.

id=1 | eventstats count(id)

The job inspector says my eventstats input is - and output is 5.

Duration (seconds)  Component               Invocations Input count Output coun
    0.001           command.eventstats      1                 -            5
    0.005           command.fields          7                 10           10

When I do the search on a field id that produces 233 results which I then pass to evenstats count

id=2 | eventstats count(id)

The job inspector says that the input count has received 100,000+ results.

Duration    Component           Invocations      Input count    Output count
    0.013   command.eventstats      1            100,000         100,022
    0.006   command.fields          11           233             233

The 100,000 eventstats hits the limit defined in limits.conf and eventstats is not applied to all the results. I am wondering why for the search on a field that has 5 results the eventstats Input Count is blank (-) but for the 233 results the Input Count is 100,000 .

Thanks