com.atlassian.jira.issue.operation
Interfaces 
BulkIssueOperation
IssueOperation
ScreenableIssueOperation
SingleIssueOperation
WorkflowIssueOperation
Classes 
BulkTransitionIssueOperation
IssueOperationImpl
IssueOperations
ScreenableSingleIssueOperationImpl
WorkflowIssueOperationImpl