/// <summary>
        /// Saving into Elastic
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSave_Click(object sender, EventArgs e)
        {
            try
            {
                //TODO Validation
                DTO.Customer entity = new DTO.Customer();

                entity.Age           = int.Parse(nudAge.Value.ToString());
                entity.Birthday      = dtpBirthday.Value.ToString(DTO.Constants.BASIC_DATE);
                entity.EnrollmentFee = double.Parse(mskEnrollmentFee.Text);
                entity.HasChildren   = bool.Parse(cboHasChildren.Text);
                entity.Name          = txtName.Text;
                entity.Opinion       = txtOpnion.Text;
                entity.Id            = int.Parse(mskId.Text);

                if (_customerBll.Index(entity))
                {
                    MessageBox.Show("Index saved!", "Ok", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }