migrate java8 to java11

[kaibocai]

Issue describing the changes in this PR

migrate java8 to java11 worker logics. Remove redundant codes.

Pull request checklist

• [X] My changes do not require documentation changes
  • [ ] Otherwise: Documentation issue linked to PR
• [X] My changes should not be added to the release notes for the next release
  • [ ] Otherwise: I've added my notes to release_notes.md
• [X] My changes do not need to be backported to a previous version
  • [ ] Otherwise: Backport tracked by issue/PR #issue_or_pr
• [ ] I have added all required tests (Unit tests, E2E tests)

Additional information

Additional PR information

[kaibocai]

Hi Team, @shreyas-gopalakrishna , @amamounelsayed , @trask , this PR is ready for review now, please take a look, thanks very much!