springboot2+es7怎么使用RestHighLevelClient

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由于spring和es的集成并不是特別友好，es的高低版本兼容問題、api更新頻率高等問題，所以我選擇是官網提供的原生Client(RestHighLevelClient)，但又不想去關注es的配置類以及和spring的集成配置、jar包沖突等問題，所以使用spring-boot-starter-data-elasticsearch。

一、引入依賴jar

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>

二、application.properties配置

spring.elasticsearch.rest.uris=http://127.0.0.1:9200,http://127.0.0.1:9201,http://127.0.0.1:9202
spring.elasticsearch.rest.connection-timeout=5s
spring.elasticsearch.rest.read-timeout=30s
logging.level.org.springframework.data.convert.CustomConversions=error

spring-boot-starter-data-elasticsearch中自動裝配es的配置類：ElasticsearchRestClientAutoConfiguration、ElasticsearchRestClientProperties。

ElasticsearchRestClientAutoConfiguration：

@ConditionalOnClass({RestHighLevelClient.class})
@ConditionalOnMissingBean({RestClient.class})
@EnableConfigurationProperties({ElasticsearchRestClientProperties.class})
public class ElasticsearchRestClientAutoConfiguration {
 
    @Configuration(
        proxyBeanMethods = false
    )
    @ConditionalOnMissingBean({RestHighLevelClient.class})
    static class RestHighLevelClientConfiguration {
        RestHighLevelClientConfiguration() {
        }
 
        @Bean
        RestHighLevelClient elasticsearchRestHighLevelClient(RestClientBuilder restClientBuilder) {
            return new RestHighLevelClient(restClientBuilder);
        }
    }
 
    @Configuration(
        proxyBeanMethods = false
    )
    @ConditionalOnMissingBean({RestClientBuilder.class})
    static class RestClientBuilderConfiguration {
        RestClientBuilderConfiguration() {
        }
 
        @Bean
        RestClientBuilderCustomizer defaultRestClientBuilderCustomizer(ElasticsearchRestClientProperties properties) {
            return new ElasticsearchRestClientAutoConfiguration.DefaultRestClientBuilderCustomizer(properties);
        }
 
        @Bean
        RestClientBuilder elasticsearchRestClientBuilder(ElasticsearchRestClientProperties properties, ObjectProvider<RestClientBuilderCustomizer> builderCustomizers) {
            HttpHost[] hosts = (HttpHost[])properties.getUris().stream().map(this::createHttpHost).toArray((x$0) -> {
                return new HttpHost[x$0];
            });
            RestClientBuilder builder = RestClient.builder(hosts);
            builder.setHttpClientConfigCallback((httpClientBuilder) -> {
                builderCustomizers.orderedStream().forEach((customizer) -> {
                    customizer.customize(httpClientBuilder);
                });
                return httpClientBuilder;
            });
            builder.setRequestConfigCallback((requestConfigBuilder) -> {
                builderCustomizers.orderedStream().forEach((customizer) -> {
                    customizer.customize(requestConfigBuilder);
                });
                return requestConfigBuilder;
            });
            builderCustomizers.orderedStream().forEach((customizer) -> {
                customizer.customize(builder);
            });
            return builder;
        }
 
        private HttpHost createHttpHost(String uri) {
            try {
                return this.createHttpHost(URI.create(uri));
            } catch (IllegalArgumentException var3) {
                return HttpHost.create(uri);
            }
        }
 
        private HttpHost createHttpHost(URI uri) {
            if (!StringUtils.hasLength(uri.getUserInfo())) {
                return HttpHost.create(uri.toString());
            } else {
                try {
                    return HttpHost.create((new URI(uri.getScheme(), (String)null, uri.getHost(), uri.getPort(), uri.getPath(), uri.getQuery(), uri.getFragment())).toString());
                } catch (URISyntaxException var3) {
                    throw new IllegalStateException(var3);
                }
            }
        }
    }
}

ElasticsearchRestClientProperties： 

@ConfigurationProperties(
    prefix = "spring.elasticsearch.rest"
)
public class ElasticsearchRestClientProperties {
    private List<String> uris = new ArrayList(Collections.singletonList("http://localhost:9200"));
    private String username;
    private String password;
    private Duration connectionTimeout = Duration.ofSeconds(1L);
    private Duration readTimeout = Duration.ofSeconds(30L);
 
    public ElasticsearchRestClientProperties() {
    }
 
    public List<String> getUris() {
        return this.uris;
    }
 
    public void setUris(List<String> uris) {
        this.uris = uris;
    }
 
    public String getUsername() {
        return this.username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getPassword() {
        return this.password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public Duration getConnectionTimeout() {
        return this.connectionTimeout;
    }
 
    public void setConnectionTimeout(Duration connectionTimeout) {
        this.connectionTimeout = connectionTimeout;
    }
 
    public Duration getReadTimeout() {
        return this.readTimeout;
    }
 
    public void setReadTimeout(Duration readTimeout) {
        this.readTimeout = readTimeout;
    }
}

三、使用

ES基本操作持久層

/**
 * es持久層
 *
 * @author yangzihe
 * @date 2022/1/24
 */
@Repository
@Slf4j
public class EsRepository {
 
    @Resource
    private RestHighLevelClient highLevelClient;
 
    /**
     * 判斷索引是否存在
     */
    public boolean existIndex(String index) {
        try {
            return highLevelClient.indices().exists(new GetIndexRequest(index), RequestOptions.DEFAULT);
        } catch (IOException e) {
            log.error("es持久層異常！index={}", index, e);
        }
        return Boolean.FALSE;
    }
 
    /**
     * 創建索引
     */
    public boolean createIndex(String index, Map<String, Object> columnMap) {
        if (existIndex(index)) {
            return Boolean.FALSE;
        }
 
        CreateIndexRequest request = new CreateIndexRequest(index);
        if (columnMap != null && columnMap.size() > 0) {
            Map<String, Object> source = new HashMap<>();
            source.put("properties", columnMap);
            request.mapping(source);
        }
        try {
            highLevelClient.indices().create(request, RequestOptions.DEFAULT);
            return Boolean.TRUE;
        } catch (IOException e) {
            log.error("es持久層異常！index={}, columnMap={}", index, columnMap, e);
        }
        return Boolean.FALSE;
    }
 
    /**
     * 刪除索引
     */
    public boolean deleteIndex(String index) {
        try {
            if (existIndex(index)) {
                AcknowledgedResponse response = highLevelClient.indices().delete(new DeleteIndexRequest(index), RequestOptions.DEFAULT);
                return response.isAcknowledged();
            }
        } catch (Exception e) {
            log.error("es持久層異常！index={}", index, e);
        }
        return Boolean.FALSE;
    }
 
    /**
     * 數據新增
     */
    public boolean insert(String index, String jsonString) {
        IndexRequest indexRequest = new IndexRequest(index);
 
        indexRequest.id(new Snowflake().nextIdStr());
        indexRequest.source(jsonString, XContentType.JSON);
 
        try {
            log.info("indexRequest={}", indexRequest);
            IndexResponse indexResponse = highLevelClient.index(indexRequest, RequestOptions.DEFAULT);
            log.info("indexResponse={}", indexResponse);
            return Boolean.TRUE;
        } catch (IOException e) {
            log.error("es持久層異常！index={}, jsonString={}", index, jsonString, e);
        }
        return Boolean.FALSE;
    }
 
    /**
     * 數據更新，可以直接修改索引結構
     */
    public boolean update(String index, Map<String, Object> dataMap) {
        UpdateRequest updateRequest = new UpdateRequest(index, dataMap.remove("id").toString());
        updateRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
        updateRequest.doc(dataMap);
        try {
            highLevelClient.update(updateRequest, RequestOptions.DEFAULT);
        } catch (IOException e) {
            log.error("es持久層異常！index={}, dataMap={}", index, dataMap, e);
            return Boolean.FALSE;
        }
        return Boolean.TRUE;
    }
 
    /**
     * 刪除數據
     */
    public boolean delete(String index, String id) {
        DeleteRequest deleteRequest = new DeleteRequest(index, id);
        try {
            highLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
        } catch (IOException e) {
            log.error("es持久層異常！index={}, id={}", index, id, e);
            return Boolean.FALSE;
        }
        return Boolean.TRUE;
    }
 
}

ES查詢持久層

/**
 * es查詢持久層
 *
 * @author yangzihe
 * @date 2022/1/25
 */
@Repository
@Slf4j
public class EsSearchRepository {
 
    @Resource
    private RestHighLevelClient highLevelClient;
 
    /**
     * 分頁查詢
     *
     * @param queryPO 分頁查詢對象
     *
     * @return 分頁查詢結果
     */
    public EsQueryRespPO<Map<String, Object>> searchPage(EsQueryReqPO queryPO) {
        // 默認分頁參數設置
        if (queryPO.getPageNum() == null) {
            queryPO.setPageNum(1);
        }
        if (queryPO.getPageSize() == null) {
            queryPO.setPageSize(10);
        }
 
        // 設置索引
        SearchRequest searchRequest = new SearchRequest(queryPO.getIndex());
 
        // 封裝查詢源對象
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        searchRequest.source(sourceBuilder);
 
        // 查詢條件
        sourceBuilder.query(queryPO.getQuery());
 
        // 排序字段
        if (StringUtils.isNotBlank(queryPO.getSortField()) && queryPO.getSort() != null) {
            FieldSortBuilder order = new FieldSortBuilder(queryPO.getSortField()).order(queryPO.getSort());
            sourceBuilder.sort(order);
        }
 
        // 開始行數，默認0
        sourceBuilder.from((queryPO.getPageNum() - 1) * queryPO.getPageSize());
        // 頁大小，默認10
        sourceBuilder.size(queryPO.getPageSize());
 
        // 查詢結果
        SearchResponse searchResponse = null;
        try {
            // log.info("es查詢請求對象：searchRequest={}", searchRequest);
            log.info("es查詢請求對象source：sourceBuilder={}", searchRequest.source());
            // 執行搜索
            searchResponse = highLevelClient.search(searchRequest, RequestOptions.DEFAULT);
            log.info("es查詢響應結果：searchResponse={}", searchResponse);
        } catch (IOException e) {
            log.error("es查詢，IO異常！searchRequest={}", searchRequest, e);
            // 異常處理
            return EsQueryRespPO.error("es查詢，IO異常！");
        }
 
        if (RestStatus.OK.equals(searchResponse.status())) {
            // 解析對象
            SearchHit[] hits = searchResponse.getHits().getHits();
            // 獲取source
            List<Map<String, Object>> sourceList = Arrays.stream(hits).map(SearchHit::getSourceAsMap).collect(Collectors.toList());
            long totalHits = searchResponse.getHits().getTotalHits().value;
            return EsQueryRespPO.success(sourceList, queryPO.getPageNum(), queryPO.getPageSize(), totalHits);
        } else {
            log.error("es查詢返回的狀態碼異常！searchResponse.status={}, searchRequest={}", searchResponse.status(), searchRequest);
            return EsQueryRespPO.error("es查詢返回的狀態碼異常！");
        }
    }
 
    /**
     * 聚合的分頁查詢
     *
     * @param queryPO 查詢請求對象
     *
     * @return 聚合分頁查詢結果
     */
    public EsQueryRespPO<AggregationBucketPO> searchAggregation(EsQueryReqPO queryPO) {
        // 設置索引
        SearchRequest searchRequest = new SearchRequest(queryPO.getIndex());
 
        // 封裝查詢源對象
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        searchRequest.source(sourceBuilder);
 
        // 查詢條件
        sourceBuilder.query(queryPO.getQuery());
 
        // 排序字段
        if (StringUtils.isNotBlank(queryPO.getSortField()) && queryPO.getSort() != null) {
            FieldSortBuilder order = new FieldSortBuilder(queryPO.getSortField()).order(queryPO.getSort());
            sourceBuilder.sort(order);
        }
 
        // 頁大小0，只返回聚合結果
        sourceBuilder.size(0);
 
        // 設置聚合查詢,可以設置多個聚合查詢條件，只要聚合查詢命名不同就行
        // 聚合分組條件, group by
        sourceBuilder.aggregation(queryPO.getTermsAggregation());
        // 聚合統計條件, count分組后的數據，計算分組后的總大小
        sourceBuilder.aggregation(queryPO.getCardinalityAggregation());
 
        // 查詢結果
        SearchResponse searchResponse = null;
        try {
            // log.info("es查詢請求對象：searchRequest={}", searchRequest);
            log.info("es查詢請求對象source：sourceBuilder={}", searchRequest.source());
            // 執行搜索
            searchResponse = highLevelClient.search(searchRequest, RequestOptions.DEFAULT);
            log.info("es查詢響應結果：searchResponse={}", searchResponse);
        } catch (IOException e) {
            log.error("es查詢，IO異常！searchRequest={}", searchRequest, e);
            return EsQueryRespPO.error("es查詢，IO異常！");
        }
 
        if (RestStatus.OK.equals(searchResponse.status())) {
            // 解析對象
            Aggregations aggregations = searchResponse.getAggregations();
 
            long docTotal = searchResponse.getHits().getTotalHits().value;
 
            // 遍歷terms聚合結果
            Terms terms = aggregations.get(queryPO.getTermsAggregation().getName());
            List<AggregationBucketPO> bucketList = terms.getBuckets().stream().map(bucket -> {
                String key = bucket.getKeyAsString();
                long docCount = bucket.getDocCount();
                return new AggregationBucketPO(key, docCount, docTotal);
            }).collect(Collectors.toList());
 
            // 總數量
            Cardinality cardinality = aggregations.get(queryPO.getCardinalityAggregation().getName());
            long totalHits = cardinality.getValue();
 
            return EsQueryRespPO.success(bucketList, queryPO.getPageNum(), queryPO.getPageSize(), totalHits);
        } else {
            log.error("es查詢返回的狀態碼異常！searchResponse.status={}, searchRequest={}", searchResponse.status(), searchRequest);
            return EsQueryRespPO.error("es查詢返回的狀態碼異常！");
        }
    }
}

其中，EsQueryReqPO、EsQueryRespPO、AggregationBucketPO等類如下：

/**
 * es查詢請求對象
 */
@Data
public class EsQueryReqPO {
 
    /**
     * 索引名
     */
    String[] index;
 
    /**
     * 查詢條件
     */
    QueryBuilder query;
 
    /**
     * 排序字段
     */
    String sortField;
 
    /**
     * 排序方式 SortOrder.ASC、SortOrder.DESC
     */
    SortOrder sort;
 
    /**
     * 頁數
     */
    private Integer pageNum;
 
    /**
     * 頁大小
     */
    private Integer pageSize;
 
    /**
     * 聚合分組條件, group by
     */
    private TermsAggregationBuilder termsAggregation;
 
    /**
     * 聚合統計條件, count分組后的數據
     */
    private CardinalityAggregationBuilder cardinalityAggregation;
}
/**
 * es分頁響應對象
 *
 * @author yangzihe
 * @date 2022/1/25
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class EsQueryRespPO<T> {
 
    /**
     * 是否成功
     */
    private Boolean success;
 
    /**
     * 信息
     */
    private String message;
 
    /**
     * 頁數
     */
    private Integer pageNum;
 
    /**
     * 頁大小
     */
    private Integer pageSize;
 
    /**
     * 總大小
     */
    private Long totalSize;
 
    /**
     * 數據
     */
    private List<T> sourceList;
 
    public static <T> EsQueryRespPO<T> success(List<T> sourceList, Integer pageNum, Integer pageSize,
                                               Long totalSize) {
        EsQueryRespPO<T> esQueryRespPO = new EsQueryRespPO<>();
        esQueryRespPO.setSuccess(true);
        esQueryRespPO.setSourceList(sourceList);
        esQueryRespPO.setPageNum(pageNum);
        esQueryRespPO.setPageSize(pageSize);
        esQueryRespPO.setTotalSize(totalSize);
        return esQueryRespPO;
    }
 
    public static EsQueryRespPO error() {
        EsQueryRespPO esQueryRespPO = new EsQueryRespPO();
        esQueryRespPO.setSuccess(false);
        esQueryRespPO.setMessage("es查詢異常");
        return esQueryRespPO;
    }
 
    public static EsQueryRespPO error(String message) {
        EsQueryRespPO esQueryRespPO = new EsQueryRespPO();
        esQueryRespPO.setSuccess(false);
        esQueryRespPO.setMessage(message);
        return esQueryRespPO;
    }
 
}

/**
 * 聚合桶對象
 *
 * @author yangzihe
 * @date 2022/1/26
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class AggregationBucketPO {
 
    /**
     * 聚合Bucket的key名
     */
    private String key;
 
    /**
     * 聚合Bucket的文檔數量
     */
    private Long docCount;
 
    /**
     * 文檔總數量
     */
    private Long docTotal;
 
}

ES多級(二級)聚合分桶查詢

import com.yy.armor.manager.common.exception.EsException;
import com.yy.armor.manager.persist.es.po.AggregationBucketPO;
import com.yy.armor.manager.persist.es.po.EsMultiAggregationReqPO;
 
import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;
import javax.annotation.Resource;
 
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.pulsar.shade.org.apache.commons.compress.utils.Lists;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.rest.RestStatus;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.FieldSortBuilder;
import org.springframework.stereotype.Repository;
 
 
@Repository
@Slf4j
public class EsSearchRepository {
 
    @Resource
    private RestHighLevelClient highLevelClient;
 
 
    /**
     * 多級聚合查詢(二級聚合)
     *
     * @param reqPO 查詢請求對象
     *
     * @return 聚合查詢結果
     */
    public List<AggregationBucketPO> searchMultiAggregation(EsMultiAggregationReqPO reqPO) {
        // 設置索引
        SearchRequest searchRequest = new SearchRequest(reqPO.getIndex());
 
        // 封裝查詢源對象
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        searchRequest.source(sourceBuilder);
 
        // 查詢條件
        sourceBuilder.query(reqPO.getQuery());
 
        // 排序字段
        if (StringUtils.isNotBlank(reqPO.getSortField()) && reqPO.getSort() != null) {
            FieldSortBuilder order = new FieldSortBuilder(reqPO.getSortField()).order(reqPO.getSort());
            sourceBuilder.sort(order);
        }
 
        // 頁大小0，只返回聚合結果
        sourceBuilder.size(0);
 
        // 聚合分桶。創建terms桶聚合，聚合名字=terms_by_XXX, 字段=XXX
        TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders.terms("terms_by_" + reqPO.getField()).field(reqPO.getField());
        if (reqPO.getFieldSize() != null) {
            termsAggregationBuilder.size(reqPO.getFieldSize());
        }
        // 二級聚合分桶
        TermsAggregationBuilder subTermsAggregationBuilder = AggregationBuilders.terms("terms_by_" + reqPO.getSubField()).field(reqPO.getSubField());
        if (reqPO.getSubFieldSize() != null) {
            subTermsAggregationBuilder.size(reqPO.getSubFieldSize());
        }
        termsAggregationBuilder.subAggregation(subTermsAggregationBuilder);
 
        // 聚合分組條件
        sourceBuilder.aggregation(termsAggregationBuilder);
 
        // 查詢結果
        SearchResponse searchResponse = null;
        try {
            log.info("es查詢請求對象source：sourceBuilder={}", searchRequest.source());
            // 執行搜索
            searchResponse = highLevelClient.search(searchRequest, RequestOptions.DEFAULT);
            log.info("es查詢響應結果：searchResponse={}", searchResponse);
        } catch (IOException e) {
            log.error("es查詢，IO異常！searchRequest={}", searchRequest, e);
            throw new EsException("es查詢，IO異常！");
        }
 
        if (RestStatus.OK.equals(searchResponse.status())) {
            // 遍歷terms聚合結果
            Terms terms = searchResponse.getAggregations().get(termsAggregationBuilder.getName());
            List<AggregationBucketPO> bucketList = terms.getBuckets().stream().map(bucket -> {
                // 一級聚合分桶的數據
                String key = bucket.getKeyAsString();
                long docCount = bucket.getDocCount();
                // 二級聚合分桶的數據
                Terms subTerms = bucket.getAggregations().get(subTermsAggregationBuilder.getName());
                List<AggregationBucketPO> subBucketList = convertTerms(subTerms);
                return new AggregationBucketPO(key, docCount, subBucketList);
            }).collect(Collectors.toList());
 
            return bucketList;
        } else {
            log.error("es查詢返回的狀態碼異常！searchResponse.status={}, searchRequest={}", searchResponse.status(), searchRequest);
            throw new EsException("es查詢返回的狀態碼異常！");
        }
    }
 
    private List<AggregationBucketPO> convertTerms(Terms terms) {
        if (CollectionUtils.isEmpty(terms.getBuckets())) {
            return Lists.newArrayList();
        }
 
        return terms.getBuckets().stream().map(bucket -> {
            String key = bucket.getKeyAsString();
            long docCount = bucket.getDocCount();
            return new AggregationBucketPO(key, docCount);
        }).collect(Collectors.toList());
    }
}

其中，EsMultiAggregationReqPO、AggregationBucketPO類如下：

@Data
public class EsMultiAggregationReqPO {
    
    /**
     * 索引名
     */
    String[] index;
 
    /**
     * 查詢條件
     */
    QueryBuilder query;
 
    /**
     * 聚合分桶字段
     */
    private String field;
 
    /**
     * 二級聚合分桶字段
     */
    private String subField;
 
    /**
     * 聚合分桶大小，非必傳
     */
    private Integer fieldSize;
 
    /**
     * 二級聚合分桶大小，非必傳
     */
    private Integer subFieldSize;
 
    /**
     * 排序字段，非必傳
     */
    String sortField;
 
    /**
     * 排序方式 SortOrder.ASC、SortOrder.DESC，非必傳
     */
    SortOrder sort;
}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class AggregationBucketPO {
    /**
     * 聚合Bucket的key名
     */
    private String key;
 
    /**
     * 聚合Bucket的文檔數量
     */
    private Long docCount;
 
    /**
     * 子桶集合
     */
    private List<AggregationBucketPO> subBucketList;
 
    public AggregationBucketPO(String key, Long docCount) {
        this.key = key;
        this.docCount = docCount;
    }
}

二級聚合分桶測試代碼 

    @PostConstruct
    private void init() {
        // 查詢對象的封裝
        EsMultiAggregationReqPO reqPO = new EsMultiAggregationReqPO();
 
        reqPO.setIndex(new String[]{"test_log"});
 
        List<Long> ids = Lists.newArrayList();
        ids.add(140L);
        ids.add(141L);
        ids.add(142L);
        QueryBuilder queryBuilder4 = QueryBuilders.termsQuery("eventId", ids);
        BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery().must(queryBuilder4);
        reqPO.setQuery(queryBuilder);
 
        reqPO.setField("eventId");
        reqPO.setFieldSize(9999);
        reqPO.setSubField("riskFlag");
 
        // 執行查詢
        List<AggregationBucketPO> esQueryRespPO = searchMultiAggregation(reqPO);
        System.out.println("esQueryRespPO=" + esQueryRespPO);
    }

其它

如果沒有用spring-boot-starter-data-elasticsearch來自動注入es組件，那么需要自己做es client的注入，es配置類如下：

/**
 * @author yangzihe
 * @date 2022/1/25
 */
@Configuration
public class EsClientConfig {
 
    @Value("${spring.elasticsearch.rest.uris}")
    private List<String> uris;
 
    @Bean
    public RestHighLevelClient restHighLevelClient() {
        List<HttpHost> httpHostList = uris.stream().map(HttpHost::create).collect(Collectors.toList());
        HttpHost[] httpHost = new HttpHost[uris.size()];
        httpHostList.toArray(httpHost);
        RestClientBuilder clientBuilder = RestClient.builder(httpHost);
        return new RestHighLevelClient(clientBuilder);
    }
 
}

Snowflake是hutool包里的，導包：

        <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-all -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.14</version>
        </dependency>

聚合查詢的測試用例：

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = StartApplication.class)
public class EsTest {
 
    @Resource
    private EsSearchRepository esSearchRepository;
 
    @Test
    public void testSearchAggregation() {
        // 查詢對象的封裝
        EsQueryReqPO queryPO = new EsQueryReqPO();
        queryPO.setIndex(new String[]{"yzh2", "yzh3"});
        queryPO.setPageNum(1);
        queryPO.setPageSize(10);
 
        // 時間戳范圍
        QueryBuilder queryBuilder1 = QueryBuilders.rangeQuery("timestamp")
            .from(System.currentTimeMillis() - 1000)
            .to(System.currentTimeMillis());
        // 登錄標識
        QueryBuilder queryBuilder2 = QueryBuilders.termQuery("name", "yang");
        BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery().must(queryBuilder1).must(queryBuilder2);
        queryPO.setQuery(queryBuilder);
 
        // 根據userName分組。創建terms桶聚合，聚合名字=terms_by_userName, 字段=payload.userName.keyword
        TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders
            .terms("terms_by_userName").field("payload.userName.keyword");
        termsAggregationBuilder.size(queryPO.getPageSize() * queryPO.getPageNum());
        termsAggregationBuilder.subAggregation(new BucketSortPipelineAggregationBuilder("bucket_field", null)
            .from((queryPO.getPageNum() - 1) * queryPO.getPageSize()).size(queryPO.getPageSize()));
        queryPO.setTermsAggregation(termsAggregationBuilder);
 
        // 根據userName聚合count統計. cardinality名=count_userName, 字段=payload.userName.keyword
        CardinalityAggregationBuilder cardinalityAggregationBuilder = AggregationBuilders
            .cardinality("count_userName").field("payload.userName.keyword");
        queryPO.setCardinalityAggregation(cardinalityAggregationBuilder);
 
        // 執行查詢
        EsQueryRespPO<AggregationBucketPO> esQueryRespPO = esSearchRepository.searchAggregation(queryPO);
    }
}

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