搜索评分机制--negative boost(想搜索的展示在前面,不想搜索的展示在后面)

3、negative boost

搜索包含java，不包含spark的doc，但是这样子很死板
搜索包含java，尽量不包含spark的doc，如果包含了spark，不会说排除掉这个doc，而是说将这个doc的分数降低
包含了negative term的doc，分数乘以negative boost，分数降低

GET /forum/article/_search 
{
  "query": {
    "boosting": {
      "positive": {
        "match": {
          "content": "java"
        }
      },
      "negative": {
        "match": {
          "content": "spark"
        }
      },
      "negative_boost": 0.2
    }
  }
}
negative的doc，会乘以negative_boost，降低分数

POST /blogs/_bulk
{ "index": { "_id": 1 }}
{"title":"Apple iPad", "content":"Apple iPad,Apple iPad" }
{ "index": { "_id": 2 }}
{"title":"Apple iPad,Apple iPad", "content":"Apple iPad" }


POST blogs/_search
{
  "query": {
    "bool": {
      "should": [
        {"match": {
          "title": {
            "query": "apple,ipad",
            "boost": 1.1
          }
        }},

        {"match": {
          "content": {
            "query": "apple,ipad",
            "boost":
          }
        }}
      ]
    }
  }
}









POST /news/_bulk
{ "index": { "_id": 1 }}
{ "content":"Apple Mac" }
{ "index": { "_id": 2 }}
{ "content":"Apple iPad" }
{ "index": { "_id": 3 }}
{ "content":"Apple employee like Apple Pie and Apple Juice" }


POST news/_search
{
  "query": {
    "bool": {
      "must": {
        "match":{"content":"apple"}
      }
    }
  }
}

POST news/_search
{
  "query": {
    "bool": {
      "must": {
        "match":{"content":"apple"}
      },
      "must_not": {
        "match":{"content":"pie"}
      }
    }
  }
}

POST news/_search
{
  "query": {
    "boosting": {
      "positive": {
        "match": {
          "content": "apple"
        }
      },
      "negative": {
        "match": {
          "content": "pie"
        }
      },
      "negative_boost": 0.5
    }
  }
}