es - elasticsearch mapping - field data type - 13

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 ：murmur3有什么特点？
答 ：

问 ：murmur3如何使用？
答 ：

# murmur3
PUT /murmur3_test
{
  "mappings" : {
    "properties" : {
      "my_murmur3" : {
        "type"   : "keyword",
        "fields" : {
          "hash" : {"type" : "murmur3"}
        }
      }
    }
  }
}

# 索引
POST /murmur3_test/_doc
{
  "my_murmur3" : "hello good me"
}

# 索引
POST /murmur3_test/_doc
{
  "my_murmur3" : "hello good me2"
}


# 搜索
GET /murmur3_test/_search
{
  "aggs" : {
    "my_murmur3_cardinality" : {
      "cardinality" : {
        "field" : "my_murmur3.hash"
      }
    }
  }
}

# 结果
{
  "took" : 6,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "murmur3_test",
        "_type" : "_doc",
        "_id" : "vpQnJHgBHtodrUzesYKc",
        "_score" : 1.0,
        "_source" : {
          "my_murmur3" : "hello good me"
        }
      },
      {
        "_index" : "murmur3_test",
        "_type" : "_doc",
        "_id" : "v5QnJHgBHtodrUzeuYKA",
        "_score" : 1.0,
        "_source" : {
          "my_murmur3" : "hello good me2"
        }
      }
    ]
  },
  "aggregations" : {
    "my_murmur3_cardinality" : {
      "value" : 2
    }
  }
}