How can I disable Liferay's xml log file?

Issue

• In {Liferay_Home}/log folder, we can see two different files as below:
       liferay.2019-08-25.log
       liferay.2019-08-25.xml
  We only want "liferay.2019-08-25.log" file and need to disable "xml" file.

Environment

• Liferay DXP 7.0
• Liferay DXP 7.1
• Liferay DXP 7.2
• Liferay DXP 7.3
• Liferay DXP 7.4

Resolution

Liferay DXP 7.0 to 7.3:

1. Extract portal-log4j.xml from /ROOT/WEB-INF/lib/portal-impl.jar/META-INF
2. Copy the file to /ROOT/WEB-INF/classes/META-INF/
3. Comment out or remove the line at the bottom of the file:

    <appender-ref ref="XML_FILE" />

4. Restart server 

Liferay DXP 7.4:

1. Extract portal-log4j.xml from /ROOT/WEB-INF/shielded-container-lib/portal-impl.jar/META-INF
2. Copy the file to /ROOT/WEB-INF/classes/META-INF/
3. Rename de file to portal-log4j-ext.xml
4. In this case it is not enough to remove the appender because if there is no property, the one that exists in the portal-loj4j.xml file will be used. So in addition to removing that appender, you have to override it with a null value so it doesn't get created. Add this line to de appenders section at the top of the file:

    <Null name="XML_FILE" />

5. Comment out or remove the following section 

    <Appender filePattern="@liferay.home@/logs/liferay.%d{yyyy-MM-dd}.xml" ignoreExceptions="false" name="XML_FILE" type="RollingFile">
      <Log4j1XmlLayout locationInfo="true" />
      <TimeBasedTriggeringPolicy />
      <DirectWriteRolloverStrategy />
    </Appender>

6. Comment out or remove the line at the bottom of the file:

    <appender-ref ref="XML_FILE" />

7. Restart the server.