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‎README.md‎

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- [Redis 实战](docs/nosql/redis/redis-action.md) - 关键词：`缓存`、`分布式锁`、`布隆过滤器`
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- [Redis 运维](docs/nosql/redis/redis-ops.md) 🔨 - 关键词：`安装`、`命令`、`集群`、`客户端`
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#### Elasticsearch
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> [Elasticsearch](docs/nosql/elasticsearch) 📚
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#### [Elasticsearch](docs/nosql/elasticsearch) 📚
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- [Elasticsearch 面试总结](docs/nosql/elasticsearch/elasticsearch-interview.md) 💯
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- [ElasticSearch 应用指南](docs/nosql/elasticsearch/elasticsearch-quickstart.md)
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- [ElasticSearch API](docs/nosql/elasticsearch/ElasticSearchRestApi.md)
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- [ElasticSearch 运维](docs/nosql/elasticsearch/elasticsearch-ops.md)
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- [Elasticsearch 简介](docs/nosql/elasticsearch/Elasticsearch简介.md)
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- [Elasticsearch 快速入门](docs/nosql/elasticsearch/Elasticsearch快速入门.md)
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- [Elasticsearch 基本概念](docs/nosql/elasticsearch/Elasticsearch基本概念.md)
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- [Elasticsearch Rest API](docs/nosql/elasticsearch/ElasticsearchRestApi.md)
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- [Elasticsearch 运维](docs/nosql/elasticsearch/Elasticsearch运维.md)
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#### HBase
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‎docs/README.md‎

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- [Redis 实战](nosql/redis/redis-action.md) - 关键词：`缓存`、`分布式锁`、`布隆过滤器`
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- [Redis 运维](nosql/redis/redis-ops.md) 🔨 - 关键词：`安装`、`命令`、`集群`、`客户端`
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#### Elasticsearch
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> [Elasticsearch](nosql/elasticsearch) 📚
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#### [Elasticsearch](nosql/elasticsearch) 📚
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- [Elasticsearch 面试总结](nosql/elasticsearch/elasticsearch-interview.md) 💯
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- [ElasticSearch 应用指南](nosql/elasticsearch/elasticsearch-quickstart.md)
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- [ElasticSearch API](nosql/elasticsearch/ElasticSearchRestApi.md)
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- [ElasticSearch 运维](nosql/elasticsearch/elasticsearch-ops.md)
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- [Elasticsearch 简介](nosql/elasticsearch/Elasticsearch简介.md)
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- [Elasticsearch 快速入门](nosql/elasticsearch/Elasticsearch快速入门.md)
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- [Elasticsearch 基本概念](nosql/elasticsearch/Elasticsearch基本概念.md)
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- [Elasticsearch Rest API](nosql/elasticsearch/ElasticsearchRestApi.md)
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- [Elasticsearch 运维](nosql/elasticsearch/Elasticsearch运维.md)
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#### HBase
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‎docs/nosql/README.md‎

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> [Elasticsearch](elasticsearch) 📚
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- [Elasticsearch 面试总结](elasticsearch/elasticsearch-interview.md) 💯
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- [ElasticSearch 应用指南](elasticsearch/elasticsearch-quickstart.md)
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- [ElasticSearch API](elasticsearch/elasticsearch-api.md)
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- [ElasticSearch 运维](elasticsearch/elasticsearch-ops.md)
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- [Elasticsearch 简介](elasticsearch/Elasticsearch简介.md)
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- [Elasticsearch 快速入门](elasticsearch/Elasticsearch快速入门.md)
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- [Elasticsearch 基本概念](elasticsearch/Elasticsearch基本概念.md)
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- [Elasticsearch Rest API](elasticsearch/ElasticsearchRestApi.md)
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- [Elasticsearch 运维](elasticsearch/Elasticsearch运维.md)
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### 图数据库
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‎docs/nosql/elasticsearch/ElasticsearchRestApi.md‎

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{"query" : {"match_all" : {}},"size":2}
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```
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### URI Search 查询语义
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Elasticsearch URI Search 遵循 QueryString 查询语义，其形式如下：
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```bash
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GET /movies/_search?q=2012&df=title&sort=year:desc&from=0&size=10&timeout=1s
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{
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"profile": true
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}
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```
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- **`q`** 指定查询语句，使用 QueryString 语义
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- **`df`** 默认字段，不指定时
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- **`sort`** 排序：from 和 size 用于分页
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- **`profile`** 可以查看查询时如何被执行的
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```bash
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GET /movies/_search?q=title:2012&sort=year:desc&from=0&size=10&timeout=1s
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{
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"profile":"true"
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}
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```
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#### Term 和 Phrase
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Beautiful Mind 等效于 Beautiful OR Mind
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"Beautiful Mind" 等效于 Beautiful AND Mind
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```bash
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# Term 查询
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GET /movies/_search?q=title:Beautiful Mind
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{
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"profile":"true"
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}
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# 使用引号，Phrase 查询
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GET /movies/_search?q=title:"Beautiful Mind"
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{
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"profile":"true"
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}
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```
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#### 分组与引号
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title:(Beautiful AND Mind)
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title="Beautiful Mind"
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#### AND、OR、NOT 或者 &&、||、!
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> 注意：AND、OR、NOT 必须大写
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```bash
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# 布尔操作符
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GET /movies/_search?q=title:(Beautiful AND Mind)
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{
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"profile":"true"
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}
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GET /movies/_search?q=title:(Beautiful NOT Mind)
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{
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"profile":"true"
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}
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```
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#### 范围查询
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- `[]` 表示闭区间
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- `{}` 表示开区间
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示例：
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```bash
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# 范围查询 ,区间写法
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GET /movies/_search?q=title:beautiful AND year:{2010 TO 2018%7D
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{
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"profile":"true"
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}
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GET /movies/_search?q=title:beautiful AND year:[* TO 2018]
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{
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"profile":"true"
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}
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```
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#### 算数符号
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```bash
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# 2010 年以后的记录
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GET /movies/_search?q=year:>2010
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{
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"profile":"true"
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}
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# 2010 年到 2018 年的记录
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GET /movies/_search?q=year:(>2010 && <=2018)
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{
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"profile":"true"
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}
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# 2010 年到 2018 年的记录
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GET /movies/_search?q=year:(+>2010 +<=2018)
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{
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"profile":"true"
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}
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```
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#### 通配符查询
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- `?` 代表 1 个字符
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- `*` 代表 0 或多个字符
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示例：
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```bash
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GET /movies/_search?q=title:mi?d
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{
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"profile":"true"
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}
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GET /movies/_search?q=title:b*
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{
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"profile":"true"
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}
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```
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#### 正则表达式
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title:[bt]oy
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#### 模糊匹配与近似查询
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示例：
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```bash
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# 相似度在 1 个字符以内
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GET /movies/_search?q=title:beautifl~1
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{
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"profile":"true"
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}
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# 相似度在 2 个字符以内
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GET /movies/_search?q=title:"Lord Rings"~2
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{
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"profile":"true"
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}
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```
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### Request Body & DSL
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Elasticsearch 除了 URI Search 查询方式，还支持将查询语句通过 Http Request Body 发起查询。
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```bash
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GET /kibana_sample_data_ecommerce/_search?ignore_unavailable=true
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{
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"profile":"true",
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"query": {
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"match_all": {}
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}
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}
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```
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#### 分页
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```bash
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GET /kibana_sample_data_ecommerce/_search?ignore_unavailable=true
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{
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"profile": "true",
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"from": 0,
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"size": 10,
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"query": {
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"match_all": {}
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}
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}
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```
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#### 排序
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最好在数字型或日期型字段上排序
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因为对于多值类型或分析过的字段排序，系统会选一个值，无法得知该值
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```bash
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GET /kibana_sample_data_ecommerce/_search?ignore_unavailable=true
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{
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"profile": "true",
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"sort": [
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{
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"order_date": "desc"
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}
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],
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"from": 1,
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"size": 10,
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"query": {
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"match_all": {}
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}
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}
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```
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#### \_source 过滤
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如果 `_source` 没有存储，那就只返回匹配的文档的元数据
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`_source` 支持使用通配符，如：`_source["name*", "desc*"]`
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示例：
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```bash
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GET /kibana_sample_data_ecommerce/_search?ignore_unavailable=true
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{
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"profile": "true",
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"_source": [
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"order_date",
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"category.keyword"
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],
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"from": 1,
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"size": 10,
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"query": {
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"match_all": {}
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}
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}
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```
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#### 脚本字段
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```bash
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GET /kibana_sample_data_ecommerce/_search?ignore_unavailable=true
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{
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"profile": "true",
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"script_fields": {
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"new_field": {
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"script": {
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"lang": "painless",
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"source":"doc['order_date'].value+' hello'"
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}
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}
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},
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"from": 1,
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"size": 10,
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"query": {
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"match_all": {}
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}
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}
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```
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#### 使用查询表达式 - Match
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```bash
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POST movies/_search
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{
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"query": {
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"match": {
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"title": "last christmas"
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}
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}
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}
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POST movies/_search
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"query": {
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"match": {
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"title": {
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"query": "last christmas",
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"operator": "and"
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}
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}
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}
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}
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```
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#### 短语搜索 - Match Phrase
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```bash
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POST movies/_search
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"query": {
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"match_phrase": {
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"title":{
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"query": "last christmas"
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}
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}
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}
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}
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```
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## 集群 API
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> [Elasticsearch 官方之 Cluster API](https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster.html)

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