Elasticsearch动态映射是否重新索引文档？

Question

问题所在

我是elasticsearch的新手，我想了解动态映射和重新索引文档之间的关系。

根据我的实验，当动态映射打开时，文档的重新索引是自动完成的。这意味着如果向文档中添加新字段，它将自动被索引。

TEST1-带映射的索引

# 1.1 create index with mapping dynamic

    PUT /product_dyn_on
        {
            "mappings" : {
                "dynamic": true,
                "properties": {
                    "price": { "type": "integer" }
                }
            }
        }


# 1.2 create a document

        POST /product_dyn_on/_doc/1
        { "price": 100 } 


# 1.3 create a document with a field that was not mapped at the beginning

        POST /product_dyn_on/_doc/2
        { "price": 100, "discount" : 20}


# 1.4 browse document to see if it has was mapped
      GET /product_dyn_on/_search

        GET /product_dyn_on/_search
        { 
          "query": {"term" : {"discount" : 20}}

        }


        GET /product_dyn_on/_search
        { 
          "query": {"match" : {"price" : 100}}

        }


# 1.5 - update first object


    PUT /product_dyn_on/_doc/1
    {
      "price" : 200,
  "discount" : 20
    }

# 1.6 - check results (both objects are returned)


        GET /product_dyn_on/_search
        { 
          "query": {"match" : {"discount" : 20}}

        }

TEST2-没有映射的索引

# 2.1 create index with mapping dynamic

        PUT /product_dyn_off
            {
                "mappings" : {
                    "dynamic": false,
                    "properties": {
                        "price": { "type": "integer" },
                        "is_active": {"type": "boolean" },
                        "price": { "type": "integer"},
                        "sold": { "type": "long"}
                    }
                }
            }


    # 2.2 create a document

            POST /product_dyn_off/_doc/1
            { "price": 100 } 


    # 2.3 create a document with a field that was not mapped at the beginning

            POST /product_dyn_off/_doc/2
            { "price": 100, "discount" : 20}


    # 2.4 browse document to see if it has was mapped
          GET /product_dyn_off/_search

            GET /product_dyn_off/_search
            { 
              "query": {"term" : {"discount" : 20}}

            }


            GET /product_dyn_off/_search
            { 
              "query": {"match" : {"price" : 100}}

            }


    # 2.5 - Update first object


        PUT /product_dyn_off/_doc/1
        {
          "price" : 200,
      "discount" : 20
        }

    # 2.6 - Check results

            GET /product_dyn_off/_search

            GET /product_dyn_off/_search
            { 
              "query": {"match" : {"discount" : 20}}

            }

            GET /product_dyn_off/_search
            { 
              "query": {"match" : {"price" : 200}}

            }


    # Clean Everything

        DELETE /product_dyn_on
        DELETE /product_dyn_off

Answer 1

默认情况下，如果发现任何新字段（null,boolean（true/false）,float,integer,object,array,string（date,long,double,text field,with keyword子字段）），那么elasticsearch将索引文档，我们可以使用动态映射和模板https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic-mapping.html进行定制

我们可以使用此关键字限制索引动态字段。true（默认值）、false（未索引但已存储）和strict（抛出并被拒绝的异常）html" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic.html