Elasticsearch 7.x 检索案例（DSL语言）

PUT /books
{
    "settings": {
        "number_of_shards": 5, 
        "number_of_replicas": 1,
        "index": {
            "analysis.analyzer.default.type" : "ik_max_word"
        }
    },
    "mappings": {
        "properties": {
            "title": {
                "type": "text",
                "fields": {
                  "keyword":{
                    "ignore_above": 256,
                    "type": "keyword"
                  }
                }
            },
            "price": {
                "type": "double"
            },
            "created_at": {
                "type": "date"
            },
            "description": {
                "type": "text",
                "fields": {
                  "keyword":{
                    "ignore_above": 256,
                    "type": "keyword"
                  }
                }
            },
            "author":{
              "type": "keyword"
            }
        }
    }
}

PUT /books/_doc/_bulk
{"index":{}}
  {"title":"vue小白到大神","price":56.2,"created_at":"2022-01-23","description":"Java是一门面向对象的编程语言，不仅吸收了C++语言的各种优点，还摒弃了C++里难以理解的多继承、指针等概念，因此Java语言具有功能强大和简单易用两个特征。","author":"开始测试"}
{"index":{}}
  {"title":"python菜鸟教程","price":56.2,"created_at":"2020-10-23","description":"Python 基础教程 Python 是一种解释型、面向对象、动态数据类型的高级程序设计语言。","author":"小华师兄"}

GET /books/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match_all": {}
        }
      ]
    }
  }
}

GET /books/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "multi_match": {
            "query": "Java从入门到放弃",
            "fields": ["*"]
          }
        }
      ],
      "filter": [
        {
          "exists": {
            "field": "title"
          }
        },
        {
          "exists": {
            "field": "description"
          }
        }
      ]
    }
  },
  "highlight": {
    "post_tags": [""],
    "pre_tags": [""],
    "fields": {
      "*":{}
    }
  }
}

结果展示：