func (c *Collection) indexFaces(input *SDK.IndexFacesInput) (*IndexFacesResponse, error) {
    svc := c.service
    op, err := svc.client.IndexFaces(input)
    if err != nil {
        svc.Errorf("error on `IndexFaces` operation; collection=%s; error=%s;", c.nameWithPrefix, err.Error())