es - elasticsearch mapping - parameters - index_prefixes

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 ：index_prefixes有什么特点？
答 ：

问 ：index_prefixes如何使用？
答 ：

# index_prefixes
PUT /index_prefixes_test
{
  "mappings" : {
    "properties" : {
      "name" : {
        "type"           : "text",
        "index_prefixes" : {
          "min_chars" : 1,
          "max_chars" : 10
        },
        "fields" : {
          "keyword" : {
            "type" : "keyword"
          }
        }
      }
    }
  }
}

# 索引
POST /index_prefixes_test/_doc/1
{
  "name" : "hello good"
}

# 索引
POST /index_prefixes_test/_doc/2
{
  "name" : "hello"
}

# 搜索
GET /index_prefixes_test/_search
{
  "query" : {
    "prefix" : {
      "name" : {
        "value" : "goo"
      }
    }
  }
}

# 结果
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "index_prefixes_test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "name" : "hello good"
        }
      }
    ]
  }
}

# 搜索，keyword没有index_prefixes配置，但是可以使用prefix查询
GET /index_prefixes_test/_search
{
  "query" : {
    "prefix" : {
      "name.keyword": {
        "value" : "hello "
      }
    }
  }
}

# 结果
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "index_prefixes_test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "name" : "hello good"
        }
      }
    ]
  }
}