code: public Runner disableRunner(Object projectIdOrPath, Integer runnerId) throws GitLabApiException {
          Response response = delete(Response.Status.OK, null,
                  "projects", getProjectIdOrPath(projectIdOrPath), "runners", runnerId);
          return (response.readEntity(Runner.class));
      }
docs: Disable a specific runner from the project. It works only if the project isn't the only project associated with
  the specified runner. If so, an error is returned. Use the {@link #removeRunner(Integer)} instead.
  
  <pre><code>GitLab Endpoint: DELETE /projects/:id/runners/:runner_id</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param runnerId  The ID of a runner
  @return Runner instance of the Runner disabled
  @throws GitLabApiException if any exception occurs