.proto' is ignored because it doesn't belong to the forced language 'go'

I am using SonarQube version 6.X and I want to scan Go Project. SonarQube 7.2.1 and above versions supports Go plugin. So, I copied go plugin of 7.x to 6.x. And while scanning I see below message
.proto’ is ignored because it doesn’t belong to the forced language 'go’
.sh is ignored because it doesn’t belong to the forced language ‘go’.
I don’t want to ignore these files any suggestion on how to make these file NOT ignored in sonarqube 6.x

Hi @maanasa0318

The minimum supported version of SonarQube is v8.9 LTS – and you won’t find any support here from copying newer plugins to older (unsupported) versions of SonarQube. You’re due for an upgrade (to v7.9 and then v8.9 at least) and then we’ll be happy to help on this question.