spring-data-elasticsearch @Field 与嵌套文档

Question

我有这个文档的索引：

{
  "brand": "Renault",
  "brand_suggest": [
    {
      "input": "Renault",
      "weight": 10
    },
   ]
}

在另一边，我试图从我的后台映射中检索此对象：

@JsonInclude(JsonInclude.Include.NON_NULL)
@Document(indexName = "brands", createIndex = false)
data class ESBrands(
        
        @Id
        @JsonProperty("id")
        val id: String? = null,

        @JsonProperty("brand_suggest")
        @Field(name = "brand_suggest")
        @CompletionField(preservePositionIncrements = false, preserveSeparators = false])
        val brandSuggest: List<String>? = null,
)

但它不起作用，因为我尝试放置嵌套对象：

{
      "input": "Renault",
      "weight": 10
    }

进入字符串列表。但我需要它是一个字符串列表。 有没有办法拥有这种语法：

 @Field(name = "brand_suggest.input.*")

这也不起作用

谢谢

Answer 1

最终添加转换器解决了问题：

@JsonInclude(JsonInclude.Include.NON_NULL)
@Document(indexName = "brands", createIndex = false)
data class ESBrands(
        
        @Id
        @JsonProperty("id")
        val id: String? = null,

        @JsonProperty("brand_suggest")
        @Field(name = "brand_suggest")
        @CompletionField(preservePositionIncrements = false, preserveSeparators = false])
        @ValueConverter(SuggestConverter::class)
        val brandSuggest: List<String>? = null,
)

然后是转换器：

import org.springframework.data.elasticsearch.core.mapping.PropertyValueConverter

class SuggestConverter : PropertyValueConverter {

    override fun write(value: Any): Any {
        return value
    }

    override fun read(value: Any): String {
        val valueString: java.util.HashMap<*, *> = value as HashMap<*, *>
        return valueString.get("input").toString()
    }
}