public void setTopic(final String topic) {
            this.topic = topic;
        }
set aliyun search toic.

@param topic topic
shenyu-plugin/shenyu-plugin-logging/shenyu-plugin-logging-aliyun-sls/src/main/java/org/apache/shenyu/plugin/aliyun/sls/config/AliyunLogCollectConfig.java