Elasticsearch QueryDSL 經常使用查詢

主要是把Elasticsearch QueryDSL查詢入門的部分進行了翻譯總結，用以備查
注：'bank' 爲示例索引

==> 列出全部index: curl 'localhost:9200/_cat/indices?v

1、檢出全部

1. 檢出索引(index)爲bank的全部文檔(document)

   • REST request URI方式: curl 'localhost:9200/bank/_search?q=*&pretty

   • REST request body方式:

     curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
      {
        "query": { "match_all": {} }
      }'

2. 匹配全部並返回第一個文檔

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": { "match_all": {} },
      "size": 1
    }'

3. 匹配全部並返回第11到20

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": { "match_all": {} },
      "from": 10,
      "size": 10
    }'

4. 匹配全部根據balance降序(DESC)排序並返回前10條數據

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": { "match_all": {} },
      "sort": { "balance": { "order": "desc" } }
    }'

-- ! 注意 !：上述中若size未指定默認爲10

2、搜索

1. 返回account_number和balance這2個fields（_source裏），至關於sql：SELECT account_number, balance FROM....

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": { "match_all": {} },
      "_source": ["account_number", "balance"]
    }'

2. 返回account_number爲20的，至關於sql的WHERE

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": { "match": { "account_number": 20 } }
    }'

3. 返回address中包含'mill'或'lane'的

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
    	"query": { "match": { "address": "mill lane" } }
    }'

4. 返回address中包含'mill lane'的

5. curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": { "match_phrase": { "address": "mill lane" } }
    }'

6. 返回address中包含'mill'和'lane'的

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": {
        "bool": {
          "must": [
            { "match": { "address": "mill" } },
            { "match": { "address": "lane" } }
          ]
        }
      }
    }'

7. 返回address中包含'mill'或'lane'的

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": {
        "bool": {
          "should": [
            { "match": { "address": "mill" } },
            { "match": { "address": "lane" } }
          ]
        }
      }
    }'

8. 返回address中不包含'mill'和'lane'的

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": {
        "bool": {
          "must_not": [
            { "match": { "address": "mill" } },
            { "match": { "address": "lane" } }
          ]
        }
      }
    }'

9. 返回age是40但state不是'ID'的

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": {
        "bool": {
          "must": [
            { "match": { "age": "40" } }
          ],
          "must_not": [
            { "match": { "state": "ID" } }
          ]
        }
      }
    }'

3、過濾器

1. 返回balance在20000和30000之間的(含)(balance大於等於20000，小於等於30000)

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "query": {
        "filtered": {
          "query": { "match_all": {} },
          "filter": {
            "range": {
              "balance": {
                "gte": 20000,
                "lte": 30000
              }
            }
          }
        }
      }
    }'

2. 按state分組並返回前10個(默認)，按分組COUNT降序(DESC)排

   • 至關於sql: SELECT COUNT() from bank GROUP BY state ORDER BY COUNT() DESC。

   • 「size=0」是設置不顯示search hit

     curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
       {
         "size": 0,
         "aggs": {
           "group_by_state": {
             "terms": {
               "field": "state"
             }
           }
         }
       }'

3. 按state分組並計算(組)平均balance(默認返回前10個按state的COUNT的降序(DESC)排)

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "size": 0,
      "aggs": {
        "group_by_state": {
          "terms": {
            "field": "state"
          },
          "aggs": {
            "average_balance": {
              "avg": {
                "field": "balance"
              }
            }
          }
        }
      }
    }'

4. 同上一個，但，本例按balance平均數的降序排

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "size": 0,
      "aggs": {
        "group_by_state": {
          "terms": {
            "field": "state",
            "order": {
              "average_balance": "desc"
            }
          },
          "aggs": {
            "average_balance": {
              "avg": {
                "field": "balance"
              }
            }
          }
        }
      }
    }'

5. 按年齡(age)20-29, 30-39, 40-49區間分組(GROUP BY), 每一個區間按性別(gender)分組， 計算平均(balance)。按句話說，就是計算不一樣年齡區間的男女平均餘額。

   curl -XPOST 'localhost:9200/bank/_search?pretty' -d '
    {
      "size": 0,
      "aggs": {
        "group_by_age": {
          "range": {
            "field": "age",
            "ranges": [
              {
                "from": 20,
                "to": 30
              },
              {
                "from": 30,
                "to": 40
              },
              {
                "from": 40,
                "to": 50
              }
            ]
          },
          "aggs": {
            "group_by_gender": {
              "terms": {
                "field": "gender"
              },
              "aggs": {
                "average_balance": {
                  "avg": {
                    "field": "balance"
                  }
                }
              }
            }
          }
        }
      }
    }'