elasticsearch之UpdateByQueryRequest

如果更新一条文档，而且知道文档id的前提下可以使用UpdateRequest即可实现，代码如下：

	/**
	 * 根据文档id更新
	 * @throws IOException
	 */
	@Test
	public void test() throws IOException {
		UpdateRequest request = new UpdateRequest("sub_bank1031","sub_bank","SvjgP24BndtcmnpzbiuL");
		request.doc("{\"aliasName\":\"中国农业发展银行林州市支行444\",\"bankType\":\"ADB\",\"bankTypeName\":\"中国农业发展银行\",\"cityId\":\"410500\",\"cityName\":\"安阳市\",\"createTime\":1515719190000,\"createUser\":\"system\",\"id\":\"000238a326b044e9ae10cfe4298f4c44\",\"isEnabled\":\"1\",\"name\":\"中国农业发展银行林州市支行\",\"provinceId\":\"410000\",\"provinceName\":\"河南省\",\"unionNumber\":\"203496100010\"}", XContentType.JSON);
		UpdateResponse resp = highLevelClient.update(request, RequestOptions.DEFAULT);
		println(resp.getResult());
	}

但是如果不知道文档id的情况如果还想使用UpdateRequest更新文档就需要先使用SearchRequest根据某个条件查询符合条件的文档，然后再循环更新文档即可。

    /**
    **先检索、再更新文档
    **/
   	@Test
	public void search() throws IOException{
		SearchRequest searchRequest = new SearchRequest("sub_bank1031");
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
		searchSourceBuilder.query(QueryBuilders.matchQuery("_id", "SvjgP24BndtcmnpzbiuL"));
		searchSourceBuilder.size(2);
		searchRequest.source(searchSourceBuilder);
		SearchResponse searchResponse = highLevelClient.search(searchRequest, RequestOptions.DEFAULT); 
		SearchHit[] searchHits = searchResponse.getHits().getHits();
	    for(SearchHit s:searchHits){
           String docId = s.getId();
    		UpdateRequest request = new UpdateRequest("sub_bank1031","sub_bank",docId);
		request.doc("{\"aliasName\":\"中国农业发展银行林州市支行444\",\"bankType\":\"ADB\",\"bankTypeName\":\"中国农业发展银行\",\"cityId\":\"410500\",\"cityName\":\"安阳市\",\"createTime\":1515719190000,\"createUser\":\"system\",\"id\":\"000238a326b044e9ae10cfe4298f4c44\",\"isEnabled\":\"1\",\"name\":\"中国农业发展银行林州市支行\",\"provinceId\":\"410000\",\"provinceName\":\"河南省\",\"unionNumber\":\"203496100010\"}", XContentType.JSON);
		UpdateResponse resp = highLevelClient.update(request, RequestOptions.DEFAULT);
		println(resp.getResult());              
	    }
	}

上面操作略显麻烦，需要多条http请求才能完成，要更新的文档数量很多时将大大降低系统响应速度，这时候我们可以使用es的UpdateByQueryRequest来实现该功能。

	/**
	 * 通过脚本更新文档
	 * @throws IOException
	 */
	@Test
	public void updateByQueryRequest() throws IOException {
		UpdateByQueryRequest request = new UpdateByQueryRequest("sub_bank1031");
		request.setDocTypes("sub_bank");
		request.setQuery(new TermQueryBuilder("cityId", "511000"));
		request.setSize(2);
		request.setScript(
			    new Script(
			        ScriptType.INLINE, "painless",
			        "if (ctx._source.bankType == 'BOC') {ctx._source.aliasName='hello'}",
			        Collections.emptyMap()));	
		BulkByScrollResponse resp = highLevelClient.updateByQuery(request, RequestOptions.DEFAULT);
	}

 

PS：

pom文件es相关依赖如下：

         <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>6.8.0</version>
        </dependency>
        <!-- elasticsearch high level -->    
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.elasticsearch</groupId>
                    <artifactId>elasticsearch</artifactId>                
                </exclusion>
            </exclusions>
            <version>6.8.0</version>
        </dependency>