将下面的Map应用到我的本地elasticsearch 7.4.1时

private static void addIndexMapping(RestHighLevelClient client, String indexName) throws IOException {
        PutMappingRequest request = new PutMappingRequest(indexName);
        XContentBuilder builder = XContentFactory.jsonBuilder();
        builder.startObject();
        {
            builder.startObject("properties");
            {
                builder.startObject("modifiedDate");
                {
                    builder.field("type", "date").field("format","yyyy-MM-dd HH:mm:ss.SSS");

                }
                builder.endObject();
            }
            builder.endObject();
        }
        builder.endObject();
        request.source(builder);
        client.indices().putMapping(request, RequestOptions.DEFAULT);
    }

我可以看到下面创建的Map

{
  "sandbox" : {
    "mappings" : {
      "modifiedDate" : {
        "full_name" : "modifiedDate",
        "mapping" : {
          "modifiedDate" : {
            "type" : "date",
            "format" : "yyyy-MM-dd HH:mm:ss.SSS"
          }
        }
      }
    }
  }
}

但在aws elk 7.4.2上应用相同的Map时，我看到了下面的Map

{
  "sandbox" : {
    "mappings" : {
      "modifiedDate" : {
        "full_name" : "modifiedDate",
        "mapping" : {
          "modifiedDate" : {
            "type" : "text",
            "fields" : {
              "keyword" : {
                "type" : "keyword",
                "ignore_above" : 256
              }
            }
          }
        }
      }
    }
  }
}

我在本地安装了elasticsearch 7.4.1，在生产环境中安装了elasticsearch 7.4.2。无法理解我的代码有什么问题。