Preliminary study on Elasticsearch polymerization--metrics

Elasticsearch is an open-source framework that provides search and correlation sequencing, while also supporting complex statistical-aggregation of stored documents. The Kubana icons are drawn based on aggregations. For more information, please refer to the Elasticsearch+logstash+kibana tutorial

Objective

The aggregations in ES are divided into two main categories: the metrics metric and the bucket bucket, and the metrics is similar to the one in SQL avg、max、min , and the bucket is similar group by .

This article simply introduces the use of metrics.

The aggregation of metrics can be divided into two types by the return type of the value: single-value aggregation and multivalued aggregation.

Single-Value aggregation

Preliminary study on Elasticsearch polymerization--metrics