一、关键词查询：
* and content: QR2112091519001 二、加上level
* and content: QR2112091519001 and (level: ERROR or level: DEBUG or level: INFO)三、多个关键词
* and content: QR2112091519001 or content: 1468842678496997377四、or
* and content: QR2112091519001 or 1468039803732676610五、短语，用双引号包括
* and content: "No responder was found for"