Remove fallback value for system_domain
Remove fallback value for system_domain

cloudfoundry-community/logsearch-for-cloudfoundry,cloudfoundry-community/logsearch-for-cloudfoundry,logsearch/logsearch-for-cloudfoundry,logsearch/logsearch-for-cloudfoundry,logsearch/logsearch-for-cloudfoundry,logsearch/logsearch-for-cloudfoundry,cloudfoundry-community/logsearch-for-cloudfoundry,cloudfoundry-community/logsearch-for-cloudfoundry,cloudfoundry-community/logsearch-for-cloudfoundry,logsearch/logsearch-for-cloudfoundry