Elasticsearch——集羣管理及文檔CRUD

時間  2019-12-08
標籤 elasticsearch 集羣 管理 文檔 crud 欄目 日誌分析 简体版
原文   原文鏈接

1. 集羣管理

Elasticsearch 提供了 cat api， 能夠查看集羣的數據node

1.1 檢查集羣的健康狀況

GET _cat/health?v
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返回結果：json

epoch      timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1548510225 21:43:45  win-es  yellow          1         1      1   1    0    0        1             0                  -                 50.0%
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1.2 查看集羣中有哪些索引

GET _cat/indices?v
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返回結果：api

health status index   uuid                   pri rep docs.count docs.deleted store.size pri.store.size
yellow open   .kibana sdht2-l3Q9SaK-neV9RKcQ   1   1          1            0      3.2kb          3.2kb
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2. 文檔CRUD

2.1 新增商品：新增文檔，創建索引

語法： PUT /index/type/idapp

PUT /ecommerce/product/1
{
  "name": "gaolujie yagao",
  "desc": "gaoxiao meibai",
  "price": 30,
  "producer": "gaolujie producer",
  "tags": ["meibai","fangzhu"]
}
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返回結果：curl

{
  "_index": "ecommerce",
  "_type": "product",
  "_id": "1",
  "_version": 1,
  "result": "created",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "created": true
}
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其他兩條數據：工具

PUT /ecommerce/product/2
{
    "name" : "jiajieshi yagao",
    "desc" :  "youxiao fangzhu",
    "price" :  25,
    "producer" :      "jiajieshi producer",
    "tags": [ "fangzhu" ]
}

PUT /ecommerce/product/3
{
    "name" : "zhonghua yagao",
    "desc" :  "caoben zhiwu",
    "price" :  40,
    "producer" : "zhonghua producer",
    "tags": [ "qingxin" ]
}
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es會自動創建index和type，不須要提早建立，並且es默認會對document每一個field都創建倒排索引，讓其能夠被搜索ui

2.2 查詢商品：檢索文檔

語法： GET /index/type/idurl

GET /ecommerce/product/1
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返回結果：spa

{
  "_index": "ecommerce",
  "_type": "product",
  "_id": "1",
  "_version": 1,
  "found": true,
  "_source": {
    "name": "gaolujie yagao",
    "desc": "gaoxiao meibai",
    "price": 30,
    "producer": "gaolujie producer",
    "tags": [
      "meibai",
      "fangzhu"
    ]
  }
}
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2.3 修改商品：替換文檔

PUT /ecommerce/product/1
{
    "name" : "jiaqiangban gaolujie yagao",
    "desc" :  "gaoxiao meibai",
    "price" :  30,
    "producer" :      "gaolujie producer",
    "tags": [ "meibai", "fangzhu" ]
}
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返回結果：命令行

{
  "_index": "ecommerce",
  "_type": "product",
  "_id": "1",
  "_version": 2,
  "result": "updated",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "created": false
}
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替換方式有一個很差，即便必須帶上全部的field，才能去進行信息的修改。例如：

PUT /ecommerce/product/1
{
    "name" : "jiaqiangban gaolujie yagao"
}
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執行 GET 查看該文檔，返回結果：

{
  "_index": "ecommerce",
  "_type": "product",
  "_id": "1",
  "_version": 3,
  "found": true,
  "_source": {
    "name": "jiaqiangban gaolujie yagao"
  }
}
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返回結果中只有 name 字段

2.4 修改商品：更新文檔

注意語法， 有 doc

POST /ecommerce/product/1/_update
{
  "doc": {
    "name": "jiaqiangban gaolujie yagao"
  }
}
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返回結果:

{
  "_index": "ecommerce",
  "_type": "product",
  "_id": "1",
  "_version": 7,
  "found": true,
  "_source": {
    "name": "jiaqiangban gaolujie yagao",
    "desc": "gaoxiao meibai",
    "price": 30,
    "producer": "gaolujie producer",
    "tags": [
      "meibai",
      "fangzhu"
    ]
  }
}
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2.5 刪除文檔

語法： DELETE /ecommerce/producer/1

DELETE /ecommerce/producet/1
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返回結果：

{
  "found": false,
  "_index": "ecommerce",
  "_type": "producet",
  "_id": "1",
  "_version": 1,
  "result": "not_found",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  }
}
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3. 搜素方式

3.1 query string search

GET /ecommerce/product/_search
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返回結果：

  • took：耗費了幾毫秒

  • timed_out：是否超時，這裏是沒有

  • _shards：數據拆成了5個分片，因此對於搜索請求，會打到全部的primary

  • shard（或者是它的某個replica shard也能夠）

  • hits.total：查詢結果的數量，3個document

  • hits.max_score：score的含義，就是document對於一個search的相關度的匹配分數，越相關，就越匹配，分數也高

  • hits.hits：包含了匹配搜索的document的詳細數據

    {
  "took": 3,             # 耗費幾毫秒
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 3,
    "max_score": 1,
    "hits": [
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": 1,
        "_source": {
          "name": "jiajieshi yagao",
          "desc": "youxiao fangzhu",
          "price": 25,
          "producer": "jiajieshi producer",
          "tags": [
            "fangzhu"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "1",
        "_score": 1,
        "_source": {
          "name": " aolujie yagao",
          "desc": "gaoxiao meibai",
          "price": 30,
          "producer": "gaolujie producer",
          "tags": [
            "meibai",
            "fangzhu"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "3",
        "_score": 1,
        "_source": {
          "name": "zhonghua yagao",
          "desc": "caoben zhiwu",
          "price": 40,
          "producer": "zhonghua producer",
          "tags": [
            "qingxin"
          ]
        }
      }
    ]
  }
}
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query string search的由來，由於search參數都是以http請求的query string來附帶的

搜索商品名稱中包含yagao的商品，並且按照售價降序排序

GET /ecommerce/product/_search?q=name:yagao&sort=price:desc
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返回結果：

{
  "took": 18,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 3,
    "max_score": null,
    "hits": [
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "3",
        "_score": null,
        "_source": {
          "name": "zhonghua yagao",
          "desc": "caoben zhiwu",
          "price": 40,
          "producer": "zhonghua producer",
          "tags": [
            "qingxin"
          ]
        },
        "sort": [
          40
        ]
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "1",
        "_score": null,
        "_source": {
          "name": " aolujie yagao",
          "desc": "gaoxiao meibai",
          "price": 30,
          "producer": "gaolujie producer",
          "tags": [
            "meibai",
            "fangzhu"
          ]
        },
        "sort": [
          30
        ]
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": null,
        "_source": {
          "name": "jiajieshi yagao",
          "desc": "youxiao fangzhu",
          "price": 25,
          "producer": "jiajieshi producer",
          "tags": [
            "fangzhu"
          ]
        },
        "sort": [
          25
        ]
      }
    ]
  }
}
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適用於臨時的在命令行使用一些工具，好比curl，快速的發出請求，來檢索想要的信息；可是若是查詢請求很複雜，是很難去構建的 在生產環境中，幾乎不多使用query string search

3.2 quert DSL

DSL: Domain Specified Language 特定領域的語言

http request body: 請求體，能夠用 json 的格式來構建查詢語法，比較方便。能夠構建各類複雜的語法。

  • 查詢全部商品

    GET /ecommerce/product/_search
{
  "query": {
    "match_all": {}
  }
}
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返回結果同上

  • 搜索商品名稱中包含yagao的商品，並且按照售價降序排序

    GET /ecommerce/product/_search
{
  "query": {
    "match": {
      "name": "yagao"
    }
  },
  "sort": [
    {
      "price": "desc"
    }
  ]
}
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  • 分頁查詢商品

    假設每頁一個商品，查詢第二頁的商品

    GET /ecommerce/product/_search
{
  "query": {
    "match_all": {}
  },
  "from": 1,
  "size": 1
}
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  • 指定查詢後返回的字段

    GET /ecommerce/product/_search
{
  "query": {
    "match_all": {}
  },
  "_source": ["name", "price"]
}
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返回結果：

{
  "took": 11,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 3,
    "max_score": 1,
    "hits": [
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": 1,
        "_source": {
          "price": 25,
          "name": "jiajieshi yagao"
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "1",
        "_score": 1,
        "_source": {
          "price": 30,
          "name": " aolujie yagao"
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "3",
        "_score": 1,
        "_source": {
          "price": 40,
          "name": "zhonghua yagao"
        }
      }
    ]
  }
}
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3.3 query filter

查詢名稱包含 yagao， 價格大於25的商品

GET /ecommerce/product/_search
{
  "query": {
    "bool": {
      "must": {
        "match": {
          "name": "yagao"
        }
      },
      "filter": {
        "range": {
          "price": {
            "gt": 25
          }
        }
      }
    }
  }
}
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3.4 full-text search 全文搜索

先增長一條數據，producer 字段中包含 yagao producer這兩個詞：

PUT /ecommerce/product/4
{
  "name": "special yagao",
  "desc": "",
  "proce": 50,
  "producer": "special yagao producer",
  "tags": ["meibai"]
}
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查詢：

GET /ecommerce/product/_search
{
  "query": {
    "match": {
      "producer": "yagao producer"
    }
  }
}
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返回結果：

{
  "took": 0,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0.70293105,
    "hits": [
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "4",
        "_score": 0.70293105,
        "_source": {
          "producer": "special yagao producer"
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "1",
        "_score": 0.25811607,
        "_source": {
          "name": " aolujie yagao",
          "desc": "gaoxiao meibai",
          "price": 30,
          "producer": "gaolujie producer",
          "tags": [
            "meibai",
            "fangzhu"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "3",
        "_score": 0.25811607,
        "_source": {
          "name": "zhonghua yagao",
          "desc": "caoben zhiwu",
          "price": 40,
          "producer": "zhonghua producer",
          "tags": [
            "qingxin"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": 0.1805489,
        "_source": {
          "name": "jiajieshi yagao",
          "desc": "youxiao fangzhu",
          "price": 25,
          "producer": "jiajieshi producer",
          "tags": [
            "fangzhu"
          ]
        }
      }
    ]
  }
}
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從結果中能夠看出, 新增的數據包含 yagao 和 producer 這兩個詞，因此評分最高。

3.5 phrase query 短語查詢

跟全文檢索相反，全文檢索會將輸入的搜索串拆解開來，去倒排索引裏面去一一匹配，只要能匹配上任意一個拆解後的單詞，就能夠做爲結果返回

phrase search，要求輸入的搜索串，必須在指定的字段文本中，徹底包含如出一轍的，才能夠算匹配，才能做爲結果返回

GET /ecommerce/product/_search
{
  "query": {
    "match_phrase": {
      "producer": "yagao producer"
    }
  }
}
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返回結果：

{
  "took": 0,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.70293105,
    "hits": [
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "4",
        "_score": 0.70293105,
        "_source": {
          "producer": "special yagao producer"
        }
      }
    ]
  }
}
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3.6 highlight search 高亮搜索結果

GET /ecommerce/product/_search
{
  "query": {
    "match": {
      "producer": "producer"
    }
  },
  "highlight": {
    "fields": {
      "producer": {}
    }
  }
}
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返回結果：

{
  "took": 0,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0.25811607,
    "hits": [
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "1",
        "_score": 0.25811607,
        "_source": {
          "name": "gaolujie yagao",
          "desc": "gaoxiao meibai",
          "price": 30,
          "producer": "gaolujie producer",
          "tags": [
            "meibai",
            "fangzhu"
          ]
        },
        "highlight": {
          "producer": [
            "gaolujie <em>producer</em>"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "3",
        "_score": 0.25811607,
        "_source": {
          "name": "zhonghua yagao",
          "desc": "caoben zhiwu",
          "price": 40,
          "producer": "zhonghua producer",
          "tags": [
            "qingxin"
          ]
        },
        "highlight": {
          "producer": [
            "zhonghua <em>producer</em>"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": 0.1805489,
        "_source": {
          "name": "jiajieshi yagao",
          "desc": "youxiao fangzhu",
          "price": 25,
          "producer": "jiajieshi producer",
          "tags": [
            "fangzhu"
          ]
        },
        "highlight": {
          "producer": [
            "jiajieshi <em>producer</em>"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "4",
        "_score": 0.14638957,
        "_source": {
          "producer": "special yagao producer"
        },
        "highlight": {
          "producer": [
            "special yagao <em>producer</em>"
          ]
        }
      }
    ]
  }
}
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4. 簡單聚合

先對tag設置能夠進行聚合分析，不然會報錯

將文本field的fielddata屬性設置爲true

PUT /ecommerce/product/_mapping
{
  "properties": {
    "tags": {
      "type": "text",
      "fielddata": true
    }
  }
}
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4.1 計算每一個tag下的商品數量

聚合查詢語法：

GET /ecommerce/product/_search
{
  "aggs": {
    "group_by_tags": {
      "terms": {
        "field": "tags"
      }
    }
  }
}
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返回結果：

{
  "took": 28,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 1,
    "hits": [
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": 1,
        "_source": {
          "name": "jiajieshi yagao",
          "desc": "youxiao fangzhu",
          "price": 25,
          "producer": "jiajieshi producer",
          "tags": [
            "fangzhu"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "4",
        "_score": 1,
        "_source": {
          "name": "special yagao",
          "desc": "",
          "price": 50,
          "producer": "special yagao producer",
          "tags": [
            "meibai"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "1",
        "_score": 1,
        "_source": {
          "name": "gaolujie yagao",
          "desc": "gaoxiao meibai",
          "price": 30,
          "producer": "gaolujie producer",
          "tags": [
            "meibai",
            "fangzhu"
          ]
        }
      },
      {
        "_index": "ecommerce",
        "_type": "product",
        "_id": "3",
        "_score": 1,
        "_source": {
          "name": "zhonghua yagao",
          "desc": "caoben zhiwu",
          "price": 40,
          "producer": "zhonghua producer",
          "tags": [
            "qingxin"
          ]
        }
      }
    ]
  },
  "aggregations": {
    "group_by_tags": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "fangzhu",
          "doc_count": 2
        },
        {
          "key": "meibai",
          "doc_count": 2
        },
        {
          "key": "qingxin",
          "doc_count": 1
        }
      ]
    }
  }
}
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能夠看到，返回結果包含了每條文檔的詳細信息，若是隻想要聚合結果，查詢時設置 size=0

GET /ecommerce/product/_search
{
  "size": 0,
  "aggs": {
    "group_by_tags": {
      "terms": {
        "field": "tags"
      }
    }
  }
}
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返回結果：

{
  "took": 5,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0,
    "hits": []
  },
  "aggregations": {
    "group_by_tags": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "fangzhu",
          "doc_count": 2
        },
        {
          "key": "meibai",
          "doc_count": 2
        },
        {
          "key": "qingxin",
          "doc_count": 1
        }
      ]
    }
  }
}
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能夠看到返回結果中就沒有詳細信息了，只有聚合信息

4.2 對名稱中包含yagao的商品，計算每一個tag下的商品數量

GET /ecommerce/product/_search
{
  "size": 0,
  "query": {
    "match": {
      "name": "yagao"
    }
  },
  "aggs": {
    "group_by_tags": {
      "terms": {
        "field": "tags"
      }
    }
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返回結果：

{
  "took": 13,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0,
    "hits": []
  },
  "aggregations": {
    "group_by_tags": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "fangzhu",
          "doc_count": 2
        },
        {
          "key": "meibai",
          "doc_count": 2
        },
        {
          "key": "qingxin",
          "doc_count": 1
        }
      ]
    }
  }
}
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4.3 先分組，再算每組的平均值，計算每一個tag下的商品的平均價格

計算每一個 tag 下的平均價格，就要在 tag 的分組的裏面再進行分組

GET /ecommerce/product/_search
{
  "size": 0,
  "aggs": {
    "group_by_tags": {
      "terms": {
        "field": "tags"
      },
      "aggs": {
        "avg_price": {
          "avg": {
            "field": "price"
          }
        }
      }
    }
  }
}
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返回結果：

{
  "took": 0,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0,
    "hits": []
  },
  "aggregations": {
    "group_by_tags": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "fangzhu",
          "doc_count": 2,
          "avg_price": {
            "value": 27.5
          }
        },
        {
          "key": "meibai",
          "doc_count": 2,
          "avg_price": {
            "value": 40
          }
        },
        {
          "key": "qingxin",
          "doc_count": 1,
          "avg_price": {
            "value": 40
          }
        }
      ]
    }
  }
}
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4.4 計算每一個tag下的商品的平均價格，而且按照平均價格降序排序

再分組裏面寫排序規則

GET /ecommerce/product/_search
{
  "size": 0, 
  "aggs": {
    "group_by_tags": {
      "terms": {
        "field": "tags",
        "order": {
          "avg_price": "desc"
        }
      },
      "aggs": {
        "avg_price": {
          "avg": {
            "field": "price"
          }
        }
      }
    }
  }
}
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返回結果：

{
  "took": 0,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0,
    "hits": []
  },
  "aggregations": {
    "group_by_tags": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "meibai",
          "doc_count": 2,
          "avg_price": {
            "value": 40
          }
        },
        {
          "key": "qingxin",
          "doc_count": 1,
          "avg_price": {
            "value": 40
          }
        },
        {
          "key": "fangzhu",
          "doc_count": 2,
          "avg_price": {
            "value": 27.5
          }
        }
      ]
    }
  }
}
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4.5 按照指定的價格範圍區間進行分組，而後在每組內再按照tag進行分組，最後再計算每組的平均價格

GET /ecommerce/product/_search
{
  "size": 0,
  "aggs": {
    "group_by_price": {
      "range": {
        "field": "price",
        "ranges": [
          {
            "from": 0,
            "to": 20
          },
          {
            "from": 20,
            "to": 40
          },
          {
            "from": 40,
            "to": 60
          }
        ]
      },
      "aggs": {
        "group_by_tags": {
          "terms": {
            "field": "tags",
            "order": {
              "avg_price": "desc"
            }
          },
          "aggs": {
            "avg_price": {
              "avg": {
                "field": "price"
              }
            }
          }
        }
      }
    }
  }
}
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返回結果：

{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0,
    "hits": []
  },
  "aggregations": {
    "group_by_price": {
      "buckets": [
        {
          "key": "0.0-20.0",
          "from": 0,
          "to": 20,
          "doc_count": 0,
          "group_by_tags": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": []
          }
        },
        {
          "key": "20.0-40.0",
          "from": 20,
          "to": 40,
          "doc_count": 2,
          "group_by_tags": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [
              {
                "key": "meibai",
                "doc_count": 1,
                "avg_price": {
                  "value": 30
                }
              },
              {
                "key": "fangzhu",
                "doc_count": 2,
                "avg_price": {
                  "value": 27.5
                }
              }
            ]
          }
        },
        {
          "key": "40.0-60.0",
          "from": 40,
          "to": 60,
          "doc_count": 2,
          "group_by_tags": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [
              {
                "key": "meibai",
                "doc_count": 1,
                "avg_price": {
                  "value": 50
                }
              },
              {
                "key": "qingxin",
                "doc_count": 1,
                "avg_price": {
                  "value": 40
                }
              }
            ]
          }
        }
      ]
    }
  }
}
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