code: public String updateByPath(String path,String entity) throws ElasticSearchException{
  		try {
  			return this.client.executeHttp(path, entity, ClientUtil.HTTP_POST);
  		}
  		catch(ElasticSearchException e){
  			return ResultUtil.hand404HttpRuntimeException(e,String.class,ResultUtil.OPERTYPE_updateDocument);
  		}
  	}
docs: 根据路径更新文档
  https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-update.html
  @param path test/_doc/1
  test/_doc/1/_update
  
  
  @param entity
  @return
  @throws ElasticSearchException