Centralize input vertically within panel-heading

How can I centralize this search input to stay in the line of text? I tried to apply margin but instead of going up, it pushes the table down

CurrentCode:

<!--tabelaservicossolicitados--><divid="paineldeordens" class="panel panel-default pull-left" style="width:74%">
              <div class="panel-heading">Lista de serviços solicitados
                  <div class="form-group has-feedback pull-right" id="pesquisadiv">
                      <input type="text" class="form-control col-xs-2 input-sm" id="inputbusca"/>
                      <span class="glyphicon glyphicon-search form-control-feedback"></span>
                  </div>
              </div>