$dm   = $this->get('doctrine_mongodb');
    $repo = $dm->getRepository('AcmeMyBundle:MyDocument');

    $criteria = array(
        'field1'    => 'value1',
        'field1'    => 'value1',
    );

    $logs = $repo->findBy(
        $criteria,                      /* criteria */
        array($field => $direction),    /* sort */
        $limit,                         /* limit */
        (($page-1)*$limit)?:null        /* skip */
    );

$count = $repo->createQueryBuilder('MyDocument')
    ->count()->getQuery()->execute();