springboot整合es客户端入门案例

springboot 2.2.5.RELEASE
elasticSearch 6.4.3

Elasticsearch Java API的四类client连接方式TransportClient，RestClient，Jest，Spring Data Elasticsearch，由于官方推荐使用RestClient，
就学习了RestClient，

pom.xml

<!-- 高阶restClient -->
		
			org.elasticsearch.client
			elasticsearch-rest-high-level-client
			6.4.3
		
		
			org.elasticsearch.client
			elasticsearch-rest-client
			6.4.3
		
		
			org.elasticsearch
			elasticsearch
			6.4.3
		

util：

@Component
public class RestClientUtils {
/**
     * 高阶Rest Client
     */
    private RestHighLevelClient client = null;
	 @PostConstruct
    private void initClient() {
    	client =  new RestHighLevelClient(RestClient.builder(new HttpHost("es服务器ip", "es服务器端口", "http")));
    }
}
//-----------------------------------》Search API 主要是些复杂查询操作《------------------------------
 /**
    * 同步 翻页查询 布尔查询 范围查询 匹配查询
    * @param keyWords  关键字
    * @param startTimeStamp  开始时间
    * @param endTimeStamp 结束时间
    * @param indexes 索引 
    * @param scrollId 翻页id
    * @return
    * @throws IOException
    */
    public String searchAllByIndexesAndKeyWord(String scrollId,String keyWords,String startTimeStamp,String endTimeStamp,String... indexes) throws IOException {
    		 //翻页：scrollId为null，第一次搜索，则返回搜索结果和浏览位置id
     	//设置scroll过期时间,2分钟
     	//查询完后，手动显式删除scrollId
     	if (scrollId == null) {
     		SearchResponse searchResponse = client.search(configParams(indexes,keyWords,startTimeStamp,endTimeStamp), RequestOptions.DEFAULT);
 			return getSourceData(searchResponse);
 		}else {
 		//再次查询不再需要配置各种参数，但需要上次查询返回的scrollId
 			SearchScrollRequest scrollRequest = new SearchScrollRequest(scrollId);
 			//重新设置过期时间 2分钟
 			scrollRequest.scroll("2m");
 			SearchResponse searchResponse = client.scroll(scrollRequest, RequestOptions.DEFAULT);
 			return getSourceData(searchResponse);
 		}

/**
     * 查询参数配置
     * @param indexes
     * @param keyWords
     * @param startTimeStamp 
     * @param endTimeStamp
     * @return
     */
    private SearchRequest configParams( String[] indexes, String keyWords,String startTimeStamp,String endTimeStamp) {
    	 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
         //(1)条件一：关键字查询     termQuery(指定字段，字段中包含的内容)-->精确查询     matchQuery --》包含有要匹配的字段即可
         MatchQueryBuilder matchQuery = QueryBuilders.matchQuery("message", keyWords);
        //（2）条件二：指定时间范围内查询 logdate字段的时间格式是（yyyy-MM-dd HH:mm:ss.SSS）
         RangeQueryBuilder rangeQuery = new RangeQueryBuilder("@timestamp");
         //QueryBuilders.boolQuery().minimumShouldMatch(0);
         
         rangeQuery.gte(startTimeStamp);
         rangeQuery.lt(endTimeStamp);
//         rangeQuery.format("dd/MM/yyyy||yyyy");
       //must 相当于and
         sourceBuilder.query(
         		QueryBuilders.boolQuery()
         						.must(matchQuery)
         						.must(rangeQuery)	 
         		);   
         //设置为false，即为不返回报文信息
         //sourceBuilder.fetchSource(false);  
         sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
         SearchRequest searchRequest2 = new SearchRequest();
         //index 相当于数据库
         searchRequest2.indices(indexes);
         searchRequest2.source(sourceBuilder);
         //翻页查询设置，设置过期时间为2分钟
        searchRequest2.scroll("2m");
         
         return searchRequest2;
    }
/**
     * 获取返回结果中的scrollId，获取hits-->hits-->_source中的数据
     * @param searchResponse
     * @return
     */
    private List<String> getSourceData(SearchResponse searchResponse) {
    	List<String> logData = new ArrayList<>();
    	//获取_scroll_id
    	String scrollId = searchResponse.getScrollId();
    	logData.add(scrollId);
    	 //Retrieving SearchHits 获取结果数据
        SearchHits hits = searchResponse.getHits();
        long totalHits = hits.getTotalHits();
        float maxScore = hits.getMaxScore();
        
        SearchHit[] searchHits = hits.getHits();
        for (SearchHit hit : searchHits) {
            // do something with the SearchHit
            String index = hit.getIndex();
            String type = hit.getType();
            String id = hit.getId();
            float score = hit.getScore();
            //获取真正要查询的数据  --》方式一
            String sourceAsString = hit.getSourceAsString();
            logData.add(sourceAsString);
          //获取真正要查询的数据  --》方式二
//            Map sourceAsMap = hit.getSourceAsMap();
//            String documentTitle = (String) sourceAsMap.get("title");
//            List