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…

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

Elastic Stack Elasticsearch

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

Topic		Replies	Views
Search.max_buckets limit error on 7.6.0 even after setting to 10000 Elasticsearch	1	414	January 19, 2022
Aggregation with large data set using bucket aggregation Elasticsearch	2	275	December 14, 2021
Bucket aggregation Kibana	3	401	June 7, 2022
Result window is too large, from + size must be less than or equal to: [10000] but was [10050] Elasticsearch	9	25955	April 23, 2018
Limit the query size in elasticsearch Elasticsearch	4	2976	July 5, 2017

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

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