Upgrade to SonarQube 5.6 LTS
Upgrade performed successfully. Updated some plugins, too.
[root@silicon sonar]# rm sonarqube-5.6/extensions/plugins/sonar-jira-plugin-1.2.jar
[root@fiber ~]# ./pgloader --with "preserve index names" mysql://sonar:******@localhost/sonar postgresql://sonar:******@localhost/sonar 2016-07-17T21:36:30.346000+02:00 LOG Main logs in '/tmp/pgloader/pgloader.log' 2016-07-17T21:36:30.364000+02:00 LOG Data errors in '/tmp/pgloader/'