es - elasticsearch mapping -parameters - properties

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 ：properties有什么特点？
答 ：

问 ：properties如何使用？
答 ：

# properties
PUT /propertes_test
{
  "mappings" : {
    "properties" : {
      "user" : {
        "properties" : {
          "name" : {"type" : "keyword"},
          "age"  : {"type" : "integer"}
        }
      },
      "users" : {
        "type"       : "nested",
        "properties" : {
          "name" : {"type" : "keyword"},
          "age"  : {"type" : "integer"}
        }
      }
    }
  }
}

# 索引
POST /propertes_test/_doc/1
{
  "user" : {
    "name" : "hello",
    "age"  : 18
  },
  "users" : [
    {
      "name" : "hello",
      "age"  : 18
    },
    {
      "name" : "good",
      "age"  : 19
    },
    {
      "name" : "me",
      "age"  : 20
    }
  ]
}

# 搜索
GET /propertes_test/_search
{
  "query" : {
    "term" : {
      "user.name" : {
        "value" : "hello"
      }
    }
  },
  "aggs" : {
    "users_agg" : {
      "nested" : {
        "path" : "users"
      },
      "aggs" : {
        "users_ages_agg" : {
          "histogram" : {
            "field"    : "users.age",
            "interval" : 1
          }
        }
      }  
    }
  }
}

# 结果
{
  "took" : 845,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.2876821,
    "hits" : [
      {
        "_index" : "propertes_test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 0.2876821,
        "_source" : {
          "user" : {
            "name" : "hello",
            "age" : 18
          },
          "users" : [
            {
              "name" : "hello",
              "age" : 18
            },
            {
              "name" : "good",
              "age" : 19
            },
            {
              "name" : "me",
              "age" : 20
            }
          ]
        }
      }
    ]
  },
  "aggregations" : {
    "users_agg" : {
      "doc_count" : 3,
      "users_ages_agg" : {
        "buckets" : [
          {
            "key" : 18.0,
            "doc_count" : 1
          },
          {
            "key" : 19.0,
            "doc_count" : 1
          },
          {
            "key" : 20.0,
            "doc_count" : 1
          }
        ]
      }
    }
  }
}