# Feature Documentation

UES is built based on the open-source version of Elasticsearch, please refer to the following documents.

## ES Development Guide

For Chinese documentation, please refer to: [《Elasticsearch:
The Definitive Guide》](https://www.elastic.co/guide/cn/elasticsearch/guide/cn/index.html)

For English documentation, please refer to: [《Elasticsearch
Reference》](https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html)

## ES API Documentation

[API
Conventions](https://www.elastic.co/guide/en/elasticsearch/reference/current/api-conventions.html)

[Document
APIs](https://www.elastic.co/guide/en/elasticsearch/reference/current/docs.html)

[Search
APIs](https://www.elastic.co/guide/en/elasticsearch/reference/current/search.html)

[Indices
APIs](https://www.elastic.co/guide/en/elasticsearch/reference/current/indices.html)

[cat
APIs](https://www.elastic.co/guide/en/elasticsearch/reference/current/cat.html)

[Cluster
APIs](https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster.html)

## Logstash

For English documentation, please refer to: [《Logstash
Reference》](https://www.elastic.co/guide/en/logstash/current/index.html)

[Configuring
Logstash](https://www.elastic.co/guide/en/logstash/current/configuration.html)

[Input
plugins](https://www.elastic.co/guide/en/logstash/current/input-plugins.html)

[Output
plugins](https://www.elastic.co/guide/en/logstash/current/output-plugins.html)

[Filter
plugins](https://www.elastic.co/guide/en/logstash/current/filter-plugins.html)