Can i override the sonarQube version through any settings?
I need to downgrade it from 10.5 to 9.9 to work for java 11.
is there any -Dsonar config for the same?
Do you want to analyze your Java 11 code? This is described in the docs how to run analyzes with Java 17 and the build uses Java 11.
If you want to downgrade your SonarQube instance and operate it with Java 11, then you need to downgrade to at most 9.8 - 9.9 already requires Java 17. And as I understood the docs, there is no supported way to downgrade the database, you would need to restore a backup.