Aggregation sorting performance implications

Hi There.

I have a parent child aggregation which counts child documents over a parent field where parents meet a certain criteria and children meet another criteria. I want these results sorted by matching children count.

I wanted to know what the performance implication would be of using this kind of sorting vs using default sorting.

Query structure is as follows:

terms {parent field}
childrenCount {

And I order by "order" : {childrenCount>childrenFilter}

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