Elasticsearch中文文档指南

一、什么是Elasticsearch

Elasticsearch是一个开源搜索引擎，可以处理各种文档类型的分布式数据，以实现数据的快速检索和分析。Elasticsearch的主要功能包括全文检索、结构化查询、分析和可视化。它使用json格式进行数据存储和检索，因此易于使用和扩展。

二、基本使用

1、创建索引

PUT /my_first_index
{
  "settings": {
    "number_of_shards": 3,
    "number_of_replicas": 1
  },
  "mappings": {
    "properties": {
      "title": {
        "type": "text"
      },
      "content": {
        "type": "text"
      },
      "date": {
        "type": "date"
      }
    }
  }
}

2、添加文档

PUT /my_first_index/_doc/1
{
  "title": "Elasticsearch Tutorial",
  "content": "This is Elasticsearch Tutorial",
  "date": "2021-01-01"
}

3、搜索

GET /my_first_index/_search?q=Elasticsearch

三、查询DSL

1、match查询

GET /articles/_search
{
  "query": {
    "match": {
      "content": "Elasticsearch Tutorial"
    }
  }
}

2、match_phrase查询

GET /articles/_search
{
  "query": {
    "match_phrase": {
      "content": "Elasticsearch Tutorial"
    }
  }
}

3、bool查询

GET /articles/_search
{
  "query": {
    "bool": {
      "must": [
        { "match": { "title":   "Search" }},
        { "match": { "content": "Elasticsearch" }}
      ],
      "filter": [
        { "term":  { "status": true }}
      ],
      "must_not": [
        { "match": { "content": "Elasticsearch Introduction" }}
      ]
    }
  }
}

四、聚合

1、terms聚合

GET /articles/_search
{
  "aggs": {
    "tags": {
      "terms": {
        "field": "tags"
      }
    }
  }
}

2、range聚合

GET /articles/_search
{
  "aggs": {
    "price_range": {
      "range": {
        "field": "price",
        "ranges": [
          { "to": 10 },
          { "from": 10, "to": 20 },
          { "from": 20 }
        ]
      }
    }
  }
}

五、特殊功能

1、分页

GET /articles/_search
{
    "from": 0, "size": 10,
    "query" : {
      "match_all" : {}
    }
}

2、scroll查询

POST /articles/_search?scroll=1m
{
  "query": {
    "match_all": {}
  }
}