I want to know sum aggregation result accuracy

Elastic Stack Elasticsearch
1

hello,

dear community members.

i want to know sum aggregation result accuracy.
is it result 100% confidence possible?

http://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-sum-aggregation.html

it's have accuracy different for both term aggregation and sum aggregation?

http://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html#search-aggregations-bucket-terms-aggregation-approximate-counts

please let me know.

thank you.