Percolator 过滤器字段类型 #

Percolator 字段类型将该字段视为查询处理。任何 JSON 对象字段都可以标记为 Percolator 字段。通常，文档被索引并用于搜索，而 Percolator 字段存储搜索条件，稍后通过 Percolate 查询将匹配文档到该条件。

参考代码 #

客户正在搜索价格在 400 美元或以下的桌子，并希望为此搜索创建警报。 创建一个映射，为查询字段分配一个 percolator 字段类型：

PUT testindex1
{
  "mappings": {
    "properties": {
      "search": {
        "properties": {
          "query": {
            "type": "percolator"
          }
        }
      },
      "price": {
        "type": "float"
      },
      "item": {
        "type": "text"
      }
    }
  }
}

索引一个查询

PUT testindex1/_doc/1
{
  "search": {
    "query": {
      "bool": {
        "filter": [
          {
            "match": {
              "item": {
                "query": "table"
              }
            }
          },
          {
            "range": {
              "price": {
                "lte": 400.00
              }
            }
          }
        ]
      }
    }
  }
}

查询中引用的字段必须已经存在于映射中。

运行一个 percolate 查询

GET testindex1/_search
{
  "query" : {
    "bool" : {
      "filter" :
        {
          "percolate" : {
            "field" : "search.query",
            "document" : {
              "item" : "Mahogany table",
              "price": 399.99
            }
          }
        }
    }
  }
}

返回结果包含原来索引的查询内容

{
  "took" : 30,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.0,
    "hits" : [
      {
        "_index" : "testindex1",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 0.0,
        "_source" : {
          "search" : {
            "query" : {
              "bool" : {
                "filter" : [
                  {
                    "match" : {
                      "item" : {
                        "query" : "table"
                      }
                    }
                  },
                  {
                    "range" : {
                      "price" : {
                        "lte" : 400.0
                      }
                    }
                  }
                ]
              }
            }
          }
        },
        "fields" : {
          "_percolator_document_slot" : [
            0
          ]
        }
      }
    ]
  }
}