Search, get bottom N search results, instead of top N, when size=N

Assume,
Api = _search
size=2
sort = based on timestamp in desc order
Assume total result count is 10,

since size is 2, my query will return top 2 results, but I want to get
bottom 2, that is 9th and 10th results

how do I write my query to get result that way?

Thanks,
Ziaul

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Try use sort in asc order.