Spring Data ElasticSearch目前（2018-5-22）还不支持ES 6.X版本的，故需要集成ES官方的RestHighLevelClient。

添加依赖

        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>6.2.4</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>6.2.4</version>
        </dependency>

配置 RestHighLevelClient

import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class ElasticSearchConfiguration extends AbstractFactoryBean {

    private static final Logger LOG = LoggerFactory.getLogger(ElasticSearchConfiguration.class);

    @Value("${elasticsearch.host}")
    private String host;

    private RestHighLevelClient restHighLevelClient;

    @Override
    public void destroy() throws Exception {
        // 关闭Client
        if (restHighLevelClient != null) {
            restHighLevelClient.close();
        }
    }

    @Override
    public Class<RestHighLevelClient> getObjectType() {
        return RestHighLevelClient.class;
    }

    @Override
    public boolean isSingleton() {
        return false;
    }

    @Override
    protected Object createInstance() throws Exception {
        try {
            // 如果有多个节点，构建多个HttpHost
            restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(
                            new HttpHost(host, 9200, "http")));
        } catch (Exception e) {
            LOG.error(e.getMessage());
        }
        return restHighLevelClient;
    }
}

application.properties

elasticsearch.host=192.168.1.17

执行查询

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Repository
public class LogDao {

    private final String INDEX = "sys_logs";
    private final String TYPE = "sysLog";

    @Autowired
    private RestHighLevelClient restHighLevelClient;


    /**
     * 根据traceId查询LOG记录
     * @param traceId
     * @return
     * @throws IOException
     */
    public List<SysLog> getLogByTraceId(String traceId) throws IOException {
        List<SysLog> result = new ArrayList();

        // term query, 查询trace字段
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.termQuery("trace", traceId));
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        // 指定索引和类型
        SearchRequest searchRequest = new SearchRequest(INDEX);
        searchRequest.types(TYPE);
        searchRequest.source(sourceBuilder);

        // 执行查询
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest);
        SearchHits hits = searchResponse.getHits();

        // 查询结果
        SearchHit[] searchHits = hits.getHits();
        for (SearchHit hit : searchHits) {
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String timestamp = (String) sourceAsMap.get("@timestamp");
            String trace = (String) sourceAsMap.get("trace");
            String service = (String) sourceAsMap.get("service");
            String level = (String) sourceAsMap.get("severity");
            Object stackTrace = sourceAsMap.get("stack_trace");
            String stack_trace = null;
            if (stackTrace != null) {
                stack_trace = (String) stackTrace;
            }

            SysLog sysLog = new SysLog(trace, stack_trace, timestamp, level, service);
            result.add(sysLog);
        }
        return result;
    }

}

此处只是简单的查询，新增/修改/删除以及复杂查询可以参考以下两个链接。

https://www.journaldev.com/18148/spring-boot-elasticsearch
https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.2/java-rest-high-search.html#_using_the_searchsourcebuilder
https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.2/java-rest-high-search-scroll.html