docs: public Milestone closeGroupMilestone(Object groupIdOrPath, Integer milestoneId) throws GitLabApiException {
  
          if (milestoneId == null) {
              throw new RuntimeException("milestoneId cannot be null");
          }
  
          GitLabApiForm formData = new GitLabApiForm().withParam("state_event", MilestoneState.CLOSE);
          Response response = put(Response.Status.OK, formData.asMap(),
                  "groups", getGroupIdOrPath(groupIdOrPath), "milestones", milestoneId);
          return (response.readEntity(Milestone.class));
      }