<form class="row " id="kereses" name="kereses" method="post" action="">
  <div class="col-md-2">
        <button class="btn btn-danger" id="uj_hiba" onclick="window.open('uj_hiba.php','_blank')"> Új Hibanapló</button>
  </div>
  <div class="col-md-2">
     <input type="text" class="form-control" id="hiba" name="hiba" placeholder="Hibajelenség">
  </div>
  <div class="col-md-2">
     <input type="text" class="form-control" id="bejelent_nev" name="bejelent_nev"  placeholder="Bejelentő neve">
  </div>
  <div class="col-md-2">
    <button type="submit" class="btn btn-primary" name="keres" id="keres" >Keresés</button>
  </div>
</form>

    <script>
        document.querySelector('input[name="hiba"]').addEventListener('keypress', event => {
        if (event.keyCode === 13) {
            document.getElementById('keres').click();
        }
        });
    </script>