GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/271
Enh: fetch only aggregation results where the hits are not needed
Aggrgations by default return the first few hits as well as the aggregation
values and counts.
In most cases, only the values and counts are needed.
It's wasteful to fetch the hits themselves. See:
https://www.elastic.co/guide/en/elasticsearch/reference/current/returning-only-agg-results.html#returning-only-agg-results
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