https://docs.atlassian.com/software/jira/docs/api/10.7.0/com/atlassian/jira/jql/util/GroupCustomFieldIndexValueConverter.html
GroupCustomFieldIndexValueConverter (Atlassian Jira - Server 10.7.0 API)
declaration: package: com.atlassian.jira.jql.util, class: GroupCustomFieldIndexValueConverter
atlassian jiraserverapi