springboot 整合elasticsearch 跨版本处理方式

场景

springboot 在整合elasticsearch 通常会受到elasticsearch 版本的影响，

1.一套代码可能要兼容多个elasticsearch 的情况

2.低版本的无法调用高版本一些方法（例如：delete_by_query）

实现逻辑

用高版本的去做参数封装，用restTemplate 去发送请求（草台战法）

实现代码

依赖

java 复制代码

<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>5.6.14</version>
</dependency>

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-client</artifactId>
    <version>5.6.14</version>
</dependency>

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

示例代码

我们以_delete_by_query 为例

java 复制代码

@Autowired
private RestTemplate restTemplate;

private ResponseEntity<JSONObject> deleteByQuery2() {
        //构建查询体
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        
        //构建查询条件
        RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("create_time");
        rangeQueryBuilder.lt(LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        rangeQueryBuilder.gte(LocalDateTime.now().minusDays(1).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        searchSourceBuilder.postFilter(rangeQueryBuilder);
        
        //打印请求体
        log.debug("请求体:{}", searchSourceBuilder);

        //发送请求
        HttpHeaders httpHeaders = new HttpHeaders();
        HttpEntity httpEntity = new HttpEntity(searchSourceBuilder.toString(), httpHeaders);
        ResponseEntity<JSONObject> resp = restTemplate.postForEntity("http://127.0.0.1:9200/order_index/_delete_by_query", httpEntity, JSONObject.class);
        if (resp.getStatusCode().equals(HttpStatus.OK)) {
            JSONObject body = resp.getBody();
            log.debug(body.toString(SerializerFeature.DisableCircularReferenceDetect));
        }
        return resp;
    }

参考这个逻辑去处理部分问题（用自带的请求(searchrequest),部分功能受到版本限制）