ES基础（二十五）综合排序：Function Score Query 优化算分

DELETE blogs
PUT /blogs/_doc/1
{
  "title":   "About popularity",
  "content": "In this post we will talk about...",
  "votes":   0
}

PUT /blogs/_doc/2
{
  "title":   "About popularity",
  "content": "In this post we will talk about...",
  "votes":   100
}

PUT /blogs/_doc/3
{
  "title":   "About popularity",
  "content": "In this post we will talk about...",
  "votes":   1000000
}


POST /blogs/_search
{
  "query": {
    "function_score": {
      "query": {
        "multi_match": {
          "query":    "popularity",
          "fields": [ "title", "content" ]
        }
      },
      "field_value_factor": {
        "field": "votes"
      }
    }
  }
}

POST /blogs/_search
{
  "query": {
    "function_score": {
      "query": {
        "multi_match": {
          "query":    "popularity",
          "fields": [ "title", "content" ]
        }
      },
      "field_value_factor": {
        "field": "votes",
        "modifier": "log1p"
      }
    }
  }
}


POST /blogs/_search
{
  "query": {
    "function_score": {
      "query": {
        "multi_match": {
          "query":    "popularity",
          "fields": [ "title", "content" ]
        }
      },
      "field_value_factor": {
        "field": "votes",
        "modifier": "log1p" ,
        "factor": 0.1
      }
    }
  }
}


POST /blogs/_search
{
  "query": {
    "function_score": {
      "query": {
        "multi_match": {
          "query":    "popularity",
          "fields": [ "title", "content" ]
        }
      },
      "field_value_factor": {
        "field": "votes",
        "modifier": "log1p" ,
        "factor": 0.1
      },
      "boost_mode": "sum",
      "max_boost": 3
    }
  }
}

POST /blogs/_search
{
  "query": {
    "function_score": {
      "random_score": {
        "seed": 911119
      }
    }
  }
}