public String rerunWorkflow(String workflowId, RerunWorkflowRequest request) {
        request.setReRunFromWorkflowId(workflowId);
        return workflowExecutor.rerun(request);
    }
Reruns the workflow from a specific task.

@param workflowId WorkflowId of the workflow you want to rerun.
@param request (@link RerunWorkflowRequest) for the workflow.
@return WorkflowId of the rerun workflow.
core/src/main/java/com/netflix/conductor/service/WorkflowServiceImpl.java