# 默认情况下，es一次展示10条数据,通过from和size来控制分页
# 查询结果详解

GET goods/_search
{
  "query": {
    "match_all": {}
  },
  "from": 0,
  "size": 100
}

GET goods

# term查询

GET goods/_search
{
  "query": {
    "term": {
      "title": {
        "value": "华为"
      }
    }
  }
}


# match查询
GET goods/_search
{
  "query": {
    "match": {
      "title": "华为手机"
    }
  },
  "size": 500
}



GET goods/_search
{
  "query": {
    "match": {
      "title": {
        "query":  "华为手机",
        "operator": "and"
      }
    }
  }
}
GET _analyze
{
  "analyzer": "ik_smart",
  "text": "施华洛世奇"
}




# wildcard 查询。查询条件分词，模糊查询
GET goods/_search
{
  "query": {
    "wildcard": {
      "title": {
        "value": "华*"
      }
    }
  }
}

# 正则查询
GET goods/_search
{
  "query": {
    "regexp": {
      "title": "\\w+(.)*"
    }
  }
}

# 前缀查询
GET goods/_search
{
  "query": {
    "prefix": {
      "brandName": {
        "value": "三"
      }
    }
  }
}


# 范围查询

GET goods/_search
{
  "query": {
    "range": {
      "price": {
        "gte": 2000,
        "lte": 3000
      }
    }
  },
  "sort": [
    {
      "price": {
        "order": "desc"
      }
    }
  ]
}

# queryString

GET goods/_search
{
  "query": {
    "query_string": {
      "fields": ["title","categoryName","brandName"], 
      "query": "华为 AND 手机"
    }
  }
}


GET goods/_search
{
  "query": {
    "simple_query_string": {
      "fields": ["title","categoryName","brandName"], 
      "query": "华为 AND 手机"
    }
  }
}



# boolquery

GET goods/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "brandName": {
              "value": "华为"
            }
          }
        }
      ],
      "filter":[ 
        {
        "term": {
          "title": "手机"
        }
       },
       {
         "range":{
          "price": {
            "gte": 2000,
            "lte": 3000
         }
         }
       }

      ]
    }
  }
}

GET goods/_search
{
  "query": {
    "bool": {
      "filter": [
        {
          "term": {
            "brandName": {
              "value": "华为"
            }
          }
        }
      ]
    }
  }
}




# 聚合查询

# 指标聚合 聚合函数

GET goods/_search
{
  "query": {
    "match": {
      "title": "手机"
    }
  },
  "aggs": {
    "max_price": {
      "max": {
        "field": "price"
      }
    }
  }
}

# 桶聚合  分组

GET goods/_search
{
  "query": {
    "match": {
      "title": "手机"
    }
  },
  "aggs": {
    "goods_brands": {
      "terms": {
        "field": "brandName",
        "size": 100
      }
    }
  }
}



GET goods/_search
{
  "query": {
    "match": {
      "title": "电视"
    }
  },
  "highlight": {
    "fields": {
      "title": {
        "pre_tags": "<font color='red'>",
        "post_tags": "</font>"
      }
    }
  }
}


# -------重建索引-----------

# 新建student_index_v1。索引名称必须全部小写

PUT student_index_v1
{
  "mappings": {
    "properties": {
      "birthday":{
        "type": "date"
      }
    }
  }
}

GET student_index_v1

PUT student_index_v1/_doc/1
{
  "birthday":"1999-11-11"
}


GET student_index_v1/_search


PUT student_index_v1/_doc/1
{
  "birthday":"1999年11月11日"
}

# 业务变更了，需要改变birthday字段的类型为text

# 1. 创建新的索引 student_index_v2
# 2. 将student_index_v1 数据拷贝到 student_index_v2

# 创建新的索引 student_index_v2
PUT student_index_v2
{
  "mappings": {
    "properties": {
      "birthday":{
        "type": "text"
      }
    }
  }
}
# 将student_index_v1 数据拷贝到 student_index_v2
# _reindex 拷贝数据
POST _reindex
{
  "source": {
    "index": "student_index_v1"
  },
  "dest": {
    "index": "student_index_v2"
  }
}

GET student_index_v2/_search



PUT student_index_v2/_doc/2
{
  "birthday":"1999年11月11日"
}



# 思考： 现在java代码中操作es，还是使用的实student_index_v1老的索引名称。
# 1. 改代码（不推荐）
# 2. 索引别名（推荐）

# 步骤：
# 0. 先删除student_index_v1
# 1. 给student_index_v2起个别名 student_index_v1



# 先删除student_index_v1
DELETE student_index_v1
# 给student_index_v2起个别名 student_index_v1
POST student_index_v2/_alias/student_index_v1


GET student_index_v1/_search
GET student_index_v2/_search