ES 中的聚合是否适用于 es 索引中的所有文档（查询全部匹配）

Question

Let's suppose I have 10^6 docs in my Es index. Will aggregation work on all the docs to get results.

GET myindex/_search
{
 "size":0,
"aggs":{
"Unique_term":{
"terms":{
"field":"category",
"size":"10000"
}
}
}
}

Also the distinct terms I want to get are less than 10k.

Answer 1

Yes, the terms aggregation will give you the result where buckets will be built based on each unique value from the category

If no size param is set then by default it returns only 10 buckets