Send array to Controller and insert into DB, with Ajax and Codeigniter

Hello,

I'm not able to receive (in the controller) the array that is sent from a View via ajax. I already tested it in console.log and the array is sent but nothing happens in the controller.

The input, "numdiags" defines the number of inputs with the date to be inserted (the array to be sent to the controller).

Here is the corresponding code:

View:

 <div class="form-group">                               
                                <label>Numero de dias a adicionar:</label>
                                <input type="number" class="form-control" name="numDiasAnuais" id="txtNumDias" min="0"/>

                            </div>
                            <div id="divForm"></div>
                            <template id="tmplLinha">
                                <div class="form-group">                                    
                                <input type="text" name="data[]" id="data" readonly="readonly" class="inserir_data form-control datasIndisponiveis"/>                                
                            </div>
                            </template>                                
                             <div class="form-group">                 
                                <button type="submit" name="submitAddDatasAnuaisIndisponiveis" id="submitAddDatasAnuaisIndisponiveis" class="form-control">Adicionar</button> 
                                <button type="button" class="form-control " data-toggle="modal" data-target="#modaldataindisponiveis">Listar Datas</button>                                    
                            </div>

Ajax:

//dATAS INDISPONIVEIS
$("#submitAddDatasAnuaisIndisponiveis").click(function () {
    event.preventDefault();



    var dataIndisponivel = new Array();        

    $("input.datasIndisponiveis").each(function(){
        dataIndisponivel.push($(this).val());

    })  

    console.log(dataIndisponivel);     


    jQuery.ajax({      

    type: "POST",
    url: "<?php echo base_url('sistema/addDatasIndisponiveis'); ?>",
    dataType: 'json',
    data: {dataIndisponivel},
    success: function(res) {
    if (res)
    {
      $('#mensagensErro').html(res);
      $("#error-dialog").modal("show");          
      //$("input#data").val('');


    }
    }
    });
});

Controller:

// #40
public function addDatasIndisponiveis()
{
    if ($this->session->userdata('logged_in') == true && $this->session->userdata('nivel') == 0) {
        // $this->load->library('form_validation');
        // $this->form_validation->set_rules('data[]', 'Datas', 'required|is_unique[tbldataindisponivel.data]');
        // if ($this->form_validation->run() == false) {

        //     $res = '<div style="color:red;">'.validation_errors().'</div>';
        //     echo json_encode('$res');
        //     exit;


        // } else {
            $datas = $this->input->post('data[]');
            for ($i = 0; $i < count($datas); $i++) {
                $inserir = $this->sistema_model->addDatasIndisponiveis($datas[$i]);
            }
            if ($inserir) {
                $res = '<div style="color:green;">Adicionado com sucesso</div>';
            }else{
                $res = '<div style="color:red;">Erro</div>';
            }

            echo json_encode($res);
            exit;
       // }

    } else {

        redirect('inicio/index', 'refresh');
    }
}