Also, why top_hits window inside aggregation buckets is 100. Does that mean, increasing the window size to 10 times will have a significant toll on performance ?

These limits are typically memory-related. Trying to carry too much back in a single response is a way to put servers under memory pressure - especially if your system is dealing with multiple concurrent users. For large result sets you'll want to break single requests into multiple using something…

Quang_D_Tr_n (Quang Dự Trần) November 9, 2019, 10:30am 2

Not sure but if the size is greater than 100, it might possibly cause error as in this thread

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Why search.max_buckets soft limit is 10000 ? What are the cons of increasing this size limit?