Spring elasticsearch - Map<string, string> 指数</string,>

Question

I have an object that contains a Map<String, String> field:

@Document(indexName = "custom-creative-template")
@Setting(settingPath = "/elasticsearch/custom-creative-template-index.json")
public class CustomCreativeTemplateIndexDto {
    Map<String, String> customValues;
}

When querying data for this index, I am getting the following error:

org.springframework.data.mapping.MappingException: Couldn't find PersistentEntity for type java.lang.String!

When using Map<String, Object> however, it works.

That's the Settings file for the index:

{
  "index": {
    "analysis": {
      "normalizer": {
        "sortable": {
          "filter": [
            "lowercase"
          ]
        }
      }
    }
  }
}

I have tried setting the FieldType in the Field annotation to FieldType.Text & FieldType.Flattened but I keep getting the same error.

Mappings :

{
  "custom-creative-template": {
    "mappings": {
      "properties": {
        "_class": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "customValues": {
          "properties": {
            "offerBullets": {
              "type": "text",
              "fields": {
                "keyword": {
                  "type": "keyword",
                  "ignore_above": 256
                }
              }
            },
           "offerDescription": {
              "type": "text",
              "fields": {
                "keyword": {
                  "type": "keyword",
                  "ignore_above": 256
                }
              }
            }
          }
        },
        "key": {
          "type": "long"
        },
        "name": {
          "type": "text",
          "fields": {
            "sort": {
              "type": "keyword",
              "normalizer": "sortable"
            }
          }
        }
      }
    }
  }
}

Answer 1

Works for me with field type object:

@Document(indexName = "custom-creative-template")
@Setting(settingPath = "/elasticsearch/custom-creative-template-index.json")
public class CustomCreativeTemplateIndexDto {
    @Field(type = FieldType.Object)
    Map<String, String> customValues;
}