code: public List<Epic> getEpicIssues(Object groupIdOrPath, Integer epicIid, int page, int perPage) throws GitLabApiException {
          Response response = get(Response.Status.OK, getPageQueryParams(page, perPage), "groups", getGroupIdOrPath(groupIdOrPath), "epics", epicIid, "issues");
          return (response.readEntity(new GenericType<List<Epic>>() { }));
      }
docs: Gets all issues that are assigned to an epic and the authenticated user has access to
  using the specified page and per page setting.
  
  <pre><code>GitLab Endpoint: GET /groups/:id/epics/:epic_iid/issues</code></pre>
  
  @param groupIdOrPath the group ID, path of the group, or a Group instance holding the group ID or path
  @param epicIid the IID of the epic to get issues for
  @param page the page to get
  @param perPage the number of issues per page
  @return a list of all epic issues belonging to the specified epic in the specified range
  @throws GitLabApiException if any exception occurs