es - elasticsearch mapping - field data type - 22

世界上并没有完美的程序，但是我们并不因此而沮丧，因为写程序就是一个不断追求完美的过程。

问 ：rank_feature有什么特点？
答 ：

问 ：rank_feature如何使用？
答 ：

# rank_feature
PUT /rank_feature_test
{
  "mappings" : {
    "properties" : {
      "my_pagerank"   : {"type" : "rank_feature"},
      "my_url_length" : {
        "type"                  : "rank_feature",
        "positive_score_impact" : false
      }
    }
  }
}

# 索引
POST /rank_feature_test/_doc
{
  "my_pagerank"   : 10,
  "my_url_length" : 20
}

# 索引
POST /rank_feature_test/_doc
{
  "my_pagerank"   : 10,
  "my_url_length" : 15
}

# 索引
POST /rank_feature_test/_doc
{
  "my_pagerank"   : 12,
  "my_url_length" : 20
}

# 索引
POST /rank_feature_test/_doc
{
  "my_pagerank"   : 12,
  "my_url_length" : 15
}

# 搜索
GET /rank_feature_test/_search
{
  "query" : {
    "rank_feature" : {
      "field" : "my_url_length"
    }
  }
}

# 结果
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 4,
      "relation" : "eq"
    },
    "max_score" : 0.537931,
    "hits" : [
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "Xh-zcXgBLGzotGjRqlxs",
        "_score" : 0.537931,
        "_source" : {
          "my_pagerank" : 10,
          "my_url_length" : 15
        }
      },
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "YB-zcXgBLGzotGjRwVwV",
        "_score" : 0.537931,
        "_source" : {
          "my_pagerank" : 12,
          "my_url_length" : 15
        }
      },
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "XR-zcXgBLGzotGjRnFxM",
        "_score" : 0.46583146,
        "_source" : {
          "my_pagerank" : 10,
          "my_url_length" : 20
        }
      },
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "Xx-zcXgBLGzotGjRtFzP",
        "_score" : 0.46583146,
        "_source" : {
          "my_pagerank" : 12,
          "my_url_length" : 20
        }
      }
    ]
  }
}


# 搜索
GET /rank_feature_test/_search
{
  "query" : {
    "rank_feature" : {
      "field" : "my_pagerank"
    }
  }
}

# 结果
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 4,
      "relation" : "eq"
    },
    "max_score" : 0.5217391,
    "hits" : [
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "Xx-zcXgBLGzotGjRtFzP",
        "_score" : 0.5217391,
        "_source" : {
          "my_pagerank" : 12,
          "my_url_length" : 20
        }
      },
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "YB-zcXgBLGzotGjRwVwV",
        "_score" : 0.5217391,
        "_source" : {
          "my_pagerank" : 12,
          "my_url_length" : 15
        }
      },
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "XR-zcXgBLGzotGjRnFxM",
        "_score" : 0.47619045,
        "_source" : {
          "my_pagerank" : 10,
          "my_url_length" : 20
        }
      },
      {
        "_index" : "rank_feature_test",
        "_type" : "_doc",
        "_id" : "Xh-zcXgBLGzotGjRqlxs",
        "_score" : 0.47619045,
        "_source" : {
          "my_pagerank" : 10,
          "my_url_length" : 15
        }
      }
    ]
  }
}