Despite "sonar.log.useJsonOutput" is enabled some logs are still not in a JSON format

There are logs which are not written as JSON format despite enabling property "sonar.log.useJsonOutput".

Both are coming from ES:

```
warning: no-jdk distributions that do not bundle a JDK are deprecated and will be removed in a future release - from sh file
```

```
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release. - we set it in the code - worth getting rid of it
see: org.sonar.application.command.EsJvmOptions#fromJvmDotOptionsFile
```

Fix issues associated with logs if possible.