Elasticsearch中使用term filter来搜索数据

Elasticsearch中使用term filter来搜索数据,第1张

Elasticsearch中使用term filter来搜索数据

当ES版本>5.2,type=text时,默认会设置两个field,一个是field本身,比如articleID,默认会分词的;还有一个是field.keyword,比如articleID.keyword,默认不分词,但是最多会最多保留256个字符。
term filter的用法下面用示例来说明。

先插入示例数据
POST /forum/article/_bulk
{ "index": { "_id": 1 }}
{ "articleID" : "XHDK-A-1293-#fJ3", "userID" : 1, "hidden": false, "postDate": "2017-01-01" }
{ "index": { "_id": 2 }}
{ "articleID" : "KDKE-B-9947-#kL5", "userID" : 1, "hidden": false, "postDate": "2017-01-02" }
{ "index": { "_id": 3 }}
{ "articleID" : "JODL-X-1937-#pV7", "userID" : 2, "hidden": false, "postDate": "2017-01-01" }
{ "index": { "_id": 4 }}
{ "articleID" : "QQPX-R-3956-#aD8", "userID" : 2, "hidden": true, "postDate": "2017-01-02" }
看一下自动建立的mapping结构
GET /forum/_mapping/article

{
  "forum": {
    "mappings": {
      "article": {
        "properties": {
          "articleID": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "hidden": {
            "type": "boolean"
          },
          "postDate": {
            "type": "date"
          },
          "userID": {
            "type": "long"
          }
        }
      }
    }
  }
}

由上面可知,当articleID的type未text时,系统会额外建立一个fields字段,type为keyword。
term filter:对搜索文本不分词,直接拿去倒排索引中匹配,你输入的是什么,就去匹配什么,下面举例说明

根据帖子ID搜索帖子
GET /forum/article/_search
{
    "query" : {
        "constant_score" : { 
            "filter" : {
                "term" : { 
                    "articleID.keyword" : "XHDK-A-1293-#fJ3"
                }
            }
        }
    }
}

搜到的结果如下:

{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 1,
    "hits": [
      {
        "_index": "forum",
        "_type": "article",
        "_id": "1",
        "_score": 1,
        "_source": {
          "articleID": "XHDK-A-1293-#fJ3",
          "userID": 1,
          "hidden": false,
          "postDate": "2017-01-01"
        }
      }
    ]
  }
}

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原文地址: http://outofmemory.cn/zaji/5700048.html

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