ElasticSearch关键字映射导致非法的状态异常

Question

在spring boot应用程序中，当将一个对象索引到es中时，我会遇到以下异常。

Suppressed: org.elasticsearch.client.ResponseException: method [PUT], host [http://localhost:9299], 
URI [/my_index_name/_doc/1000001_000000004-v2?timeout=5s], status line [HTTP/1.1 400 Bad Request]
{"error":{"root_cause":[{"type":"mapper_parsing_exception","reason":"failed to parse field [billingperiod] 
of type [keyword] in document with id '1000001_000000004-v2'. Preview of field's value: 
'{enddate=2016-12-31, startdate=2016-10-01}'"}],"type":"mapper_parsing_exception","reason":"failed to 
parse field [billingperiod] of type [keyword] in document with id '1000001_000000004-v2'. Preview of 
field's value: '{enddate=2016-12-31, startdate=2016-10-01}'","caused_by":{"type":"illegal_state_exception",
"reason":"Can't get text on a START_OBJECT at 1:399"}},"status":400}
    at org.elasticsearch.client.RestClient.convertResponse(RestClient.java:318)
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:288)
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:262)
    at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1628)
    ... 133 common frames omitted
Caused by: org.elasticsearch.ElasticsearchException: 
Elasticsearch exception [type=illegal_state_exception, reason=Can't get text on a START_OBJECT at 1:399]
at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:496)
at org.elasticsearch.ElasticsearchException.fromXContent(ElasticsearchException.java:407)
at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:437)
at org.elasticsearch.ElasticsearchException.failureFromXContent(ElasticsearchException.java:603)
at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:179)
... 136 common frames omitted

这个类有两个静态字段和两个类型为LocalDate的实例变量，还有一个视图方法，其中一个是被重写的toString。

映射如下。没有映射，索引就可以正常工作。但是，由于对象可以为null，因此需要配置null_值。

    {
      "dynamic_templates": [
        {
          "mapStringToKeywordByDefault": {
            "match_mapping_type": "string",
            "mapping": {
              "type": "keyword"
            }
          }
        }
      ],
      "properties": {
        "billingperiod": {
          "type": "keyword",
          "null_value": "anemptystring"
        }
      }
    }

我试图将关键字替换为展平，但是，文档声明：“一个字符串值，它被展平对象字段中的任何显式空值替换。默认值为null，这意味着空sield被视为丢失。”因此，如果对象本身为空，则它不工作。

ElasticSearch 7.10版本（无法更改）

我犯了什么错？我该怎么做才能让它工作？

Answer 1

您的映射应该正确地反映您的数据模式，因此您应该有如下内容：

"billingperiod": {
  "properties": {
    "startdate": {"type": "date"},
    "enddate": {"type": "date"}
  }
}