Home | 简体中文 | 繁体中文 | 杂文 | 打赏(Donations) | ITEYE 博客 | OSChina 博客 | Facebook | Linkedin | 知乎专栏 | Search | About

8.7. 映射

8.7.1. 查看 _mapping

curl -XGET http://localhost:9200/information/news/_mapping?pretty		
			

数据结构如下

{
  "information" : {
    "mappings" : {
      "news" : {
        "_all" : {
          "analyzer" : "ik_max_word"
        },
        "properties" : {
          "content" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          },
          "ctime" : {
            "type" : "string"
          },
          "division_category_id" : {
            "type" : "long"
          },
          "tag" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          },
          "title" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          }
        }
      }
    }
  }
}
			

8.7.2. 删除 _mapping

curl -XDELETE http://localhost:9200/information/news/_mapping?pretty		
			

8.7.3. 创建 _mapping

curl -XPOST http://localhost:9200/information/news/_mapping?pretty -d'
{
    "news": {
        "_all": {
	       "analyzer": "ik_max_word",
	       "search_analyzer": "ik_max_word",
	       "term_vector": "no",
	       "store": "false"
        },
        "properties": {
            "content": {
                "type": "string",
                "store": "no",
                "term_vector": "with_positions_offsets",
                "analyzer": "ik_max_word",
                "search_analyzer": "ik_max_word",
                "include_in_all": "true",
                "boost": 8
            }
        }
    }
}'
			

8.7.4. 更新 mapping

注意:更新只能用于空的index,如果index中存在数据无法修改_mapping,必须重建,或者采用别名方案

更新已存在的 mapping,首先我们创建一个 _mapping

			
% curl "http://localhost:9200/information/article/_mapping?pretty"
{
  "information" : {
    "mappings" : {
      "article" : {
        "properties" : {
          "content" : {
            "type" : "text",
            "analyzer" : "ik_max_word"
          },
          "title" : {
            "type" : "text",
            "analyzer" : "ik_max_word"
          }
        }
      }
    }
  }
}

			
			

在这个 _mapping 中增加 ctime 字段,定义时间格式为 yyyy-MM-dd HH:mm:ss

			
% curl -XPOST http://localhost:9200/information/article/_mapping -d'
{
        "properties": {
        "ctime": {
               "type":   "date",
               "format": "yyyy-MM-dd HH:mm:ss"
           }
        }
}'

			
			

查看预期结果

			
% curl "http://localhost:9200/information/article/_mapping?pretty"  
{
  "information" : {
    "mappings" : {
      "article" : {
        "properties" : {
          "content" : {
            "type" : "text",
            "analyzer" : "ik_max_word"
          },
          "ctime" : {
            "type" : "date",
            "format" : "yyyy-MM-dd HH:mm:ss"
          },
          "title" : {
            "type" : "text",
            "analyzer" : "ik_max_word"
          }
        }
      }
    }
  }
}

			
			

8.7.5. 修改 _mapping

修改流程需要经历五步,首先创建新索引,创建新_mapping,导入数据,索引别名,删除旧索引。

当然你也可以删除重建索引,为什么会这么折腾呢?因为这样不用停止业务的情况下进行迁移。

			
# curl -XGET http://localhost:9200/information_v1/news/_mapping?pretty
{
  "information_v1" : {
    "mappings" : {
      "news" : {
        "_all" : {
          "analyzer" : "ik_max_word"
        },
        "properties" : {
          "content" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          },
          "ctime" : {
            "type" : "string"
          },
          "division_category_id" : {
            "type" : "long"
          },
          "tag" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          },
          "title" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          }
        }
      }
    }
  }
}

			
			

注意 ctime 数据类型定义错误,现在需要将它改为date日期类型。

创建 information_v2 索引

			
curl -XPUT http://localhost:9200/information_v2
curl -XPOST http://localhost:9200/information_v2/news/_mapping?pretty -d'
{
    "news": {
            "_all": {
            "analyzer": "ik_max_word",
            "search_analyzer": "ik_max_word",
            "term_vector": "no",
            "store": "false"
        	},
		"properties": {
			"title": {
                "type": "string",
                "store": "no",
                "term_vector": "with_positions_offsets",
                "analyzer": "ik_max_word",
                "search_analyzer": "ik_max_word",
                "include_in_all": "true",
                "boost": 8
			},
			"content": {
                "type": "string",
                "store": "no",
                "term_vector": "with_positions_offsets",
                "analyzer": "ik_max_word",
                "search_analyzer": "ik_max_word",
                "include_in_all": "true",
                "boost": 8
			},
			"tag": {
                "type": "string",
                "store": "no",
                "term_vector": "with_positions_offsets",
                "analyzer": "ik_max_word",
                "search_analyzer": "ik_max_word",
                "include_in_all": "true",
                "boost": 8
            },
            "ctime": { 
				"type": "date"
		    }
        }
    }
}'	
			
			

查看全新 _mapping

			
# curl -XGET http://localhost:9200/information_v2/news/_mapping?pretty
{
  "information_v2" : {
    "mappings" : {
      "news" : {
        "_all" : {
          "analyzer" : "ik_max_word"
        },
        "properties" : {
          "content" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          },
          "ctime" : {
            "type" : "date",
            "format" : "strict_date_optional_time||epoch_millis"
          },
          "tag" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          },
          "title" : {
            "type" : "string",
            "boost" : 8.0,
            "term_vector" : "with_positions_offsets",
            "analyzer" : "ik_max_word",
            "include_in_all" : true
          }
        }
      }
    }
  }
}
			
			

现在导入数据,导入完成后修改别名,将information 从 information_v1 切换到 information_v2

			
curl -XPOST http://localhost:9200/_aliases -d '
{
    "actions": [
        { "remove": {
            "alias": "information",
            "index": "information_v1"
        }},
        { "add": {
            "alias": "information",
            "index": "information_v2"
        }}
    ]
}
'
			
			

当所以切换完成information_v1 已经没有什么用处了,这时可以删除information_v1

			
curl -XDELETE http://localhost:9200/information_v1
			
			

8.7.6. 数据类型

string, date, long, double, boolean or ip.

8.7.6.1. date

elasticsearch 采用 ISO 8601 标准的 date 格式

				
{"LastUpdate": {
    "type" : "date",
    "format" : "yyyy-MM-dd HH:mm:ss"}
}				
				
				
				
{
  "mappings": {
    "my_type": {
      "properties": {
        "date": {
          "type":   "date",
          "format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"
        }
      }
    }
  }
}