SpringBoot项目中进行Elasticsearch的多层嵌套搜索查询，
这里通过省市区示例进行演示：
目前存放的数据是：

{
  "_index": "province_info",
  "_type": "_doc",
  "_id": "1",
  "_version": 1,
  "_score": 0,
  "_source": {
    "_class": "com.etc.ec.share.api.entity.es.order.ProvinceInfoEntity",
    "provinceName": "江苏省",
    "provinceCode": "05",
    "cityInfos": [
      {
        "id": 102,
        "cityName": "苏州市",
        "cityCode": "102"
      },
      {
        "id": 0,
        "districtInfos": [
          {
            "id": 1001,
            "districtName": "姑苏区",
            "districtCode": "1001"
          },
          {
            "id": 1002,
            "districtName": "工业园区",
            "districtCode": "1002"
          }
        ]
      }
    ],
    "id": 1
  }
}

首先定义索引结构

一种是通过Postman工具或Kibana界面来进行API创建；
另一种是通过SpringBoot的@Document注解声明实体类方式（默认是自动创建索引但是不会设置setting）；

@Document源码：

// 默认true，自动创建索引
boolean createIndex() default true;

Elasticsearch实体结构：

import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.SuperBuilder;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;

import java.io.Serializable;
import java.util.List;

/**
 * created by etc.
 *
 * @author: xxxx
 * @date: 2022/5/18
 * @description: 省市区
 */
@Document(indexName = "province_info", shards = 5, replicas = 1)
@Data
@NoArgsConstructor
@SuperBuilder
public class ProvinceEntity {
    /**
     * id
     */
    @Field(type = FieldType.Long)
    private long id;
    /**
     * 省名称
     */
    @Field(type = FieldType.Keyword)
    private String provinceName;
    /**
     * 省编码
     */
    @Field(type = FieldType.Keyword)
    private String provinceCode;
    /**
     * 市信息
     */
    @Field(type = FieldType.Nested)
    private List<CityInfo> cityInfos;

    @Builder
    @Data
    public static class CityInfo implements Serializable {
        /**
         * id
         */
        @Field(type = FieldType.Long)
        private long id;
        /**
         * 市名称
         */
        @Field(type = FieldType.Keyword)
        private String cityName;
        /**
         * 市编码
         */
        @Field(type = FieldType.Keyword)
        private String cityCode;

        /**
         * 区信息
         */
        @Field(type = FieldType.Nested)
        private List<DistrictInfo> districtInfos;
        @Builder
        @Data
        public static class DistrictInfo implements Serializable {
            /**
             * id
             */
            @Field(type = FieldType.Long)
            private long id;
            /**
             * 区名称
             */
            @Field(type = FieldType.Keyword)
            private String districtName;
            /**
             * 区编码
             */
            @Field(type = FieldType.Keyword)
            private String districtCode;
        }
    }
}

json格式：

{
    "cityInfos": [
        {
            "cityCode": "",
            "cityName": "",
            "districtInfos": [
                {
                    "districtCode": "",
                    "districtName": "",
                    "id": 0
                }
            ],
            "id": 0
        }
    ],
    "id": 0,
    "provinceCode": "",
    "provinceName": ""
}

写入数据

    @Autowired
    private ElasticsearchRestTemplate elasticsearchRestTemplate;
    @Test
    public void testInsertDocument(){
        ProvinceInfoEntity provinceInfoEntity = ProvinceInfoEntity.builder().build();
        provinceInfoEntity.setId(1L);
        provinceInfoEntity.setProvinceCode("05");
        provinceInfoEntity.setProvinceName("江苏省");
        ProvinceInfoEntity.CityInfo cityInfo1 = ProvinceInfoEntity.CityInfo.builder().build();
        cityInfo1.setCityCode("101");
        cityInfo1.setCityName("南京市");
        cityInfo1.setId(101);
        ProvinceInfoEntity.CityInfo cityInfo2 = ProvinceInfoEntity.CityInfo.builder().build();
        cityInfo2.setCityCode("102");
        cityInfo2.setCityName("苏州市");
        cityInfo2.setId(102);
        ProvinceInfoEntity.CityInfo.DistrictInfo districtInfo1 = ProvinceInfoEntity.CityInfo.DistrictInfo.builder().build();
        ProvinceInfoEntity.CityInfo.DistrictInfo districtInfo2 = ProvinceInfoEntity.CityInfo.DistrictInfo.builder().build();
        ProvinceInfoEntity.CityInfo.DistrictInfo districtInfo3 = ProvinceInfoEntity.CityInfo.DistrictInfo.builder().build();
        ProvinceInfoEntity.CityInfo.DistrictInfo districtInfo4 = ProvinceInfoEntity.CityInfo.DistrictInfo.builder().build();

        List<ProvinceInfoEntity.CityInfo.DistrictInfo> districtInfos = new ArrayList<>();
        List<ProvinceInfoEntity.CityInfo.DistrictInfo> districtInfos1 = new ArrayList<>();
        districtInfo1.setId(1001);
        districtInfo1.setDistrictName("工业园区");
        districtInfo1.setDistrictCode("1001");
        districtInfo2.setId(1002);
        districtInfo2.setDistrictName("相城区");
        districtInfo2.setDistrictCode("1002");
        districtInfo3.setId(1003);
        districtInfo3.setDistrictName("姑苏区");
        districtInfo3.setDistrictCode("1003");
        districtInfos.add(districtInfo1);
        districtInfos.add(districtInfo2);
        districtInfos.add(districtInfo3);

        districtInfo4.setDistrictCode("10");
        districtInfo4.setDistrictName("鼓楼区");
        districtInfos1.add(districtInfo4);
        cityInfo1.setDistrictInfos(districtInfos1);

        cityInfo2.setDistrictInfos(districtInfos);
        List<ProvinceInfoEntity.CityInfo> cityInfos = new ArrayList<>();
        cityInfos.add(cityInfo1);
        cityInfos.add(cityInfo2);
        provinceInfoEntity.setCityInfos(cityInfos);
        elasticsearchRestTemplate.save(provinceInfoEntity);
    }

嵌套搜索查询

    @Autowired
    private ElasticsearchRestTemplate elasticsearchRestTemplate;
    @Test
    public void testSearch(){
        QueryBuilder provinceItemsQuery = QueryBuilders.nestedQuery("cityInfos.districtInfos",
                QueryBuilders.boolQuery()
                        .should(QueryBuilders.matchQuery("cityInfos.districtInfos.districtName", "工业园区"))
                        .should(QueryBuilders.matchQuery("cityInfos.districtInfos.districtCode", "工业园区")),
                ScoreMode.Total);
        //构建分页
        NativeSearchQueryBuilder builder=new NativeSearchQueryBuilder();
        NativeSearchQuery query=builder.withQuery(provinceItemsQuery)
                .build();
        SearchHits<ProvinceInfoEntity> search = elasticsearchRestTemplate.search(query, ProvinceInfoEntity.class);
        Stream<SearchHit<ProvinceInfoEntity>> searchHitStream = search.get();
    }

传送门：
Elasticsearch多层级嵌套模糊搜索高亮关键词实现

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