<aura:iteration items="{!v.QliList}" var="Qli" indexVar="sNo">
               <tr>
                    <td><div class="slds-truncate">{!sNo+1}</div></td>
                    <td><div class="slds-truncate">{!Qli.Name}</div></td>
                    <td><div class="slds-truncate">{!Qli.Description__c}</div></td>
                   <td><div class="slds-truncate">{!Qli.Family__c}</div></td>
                   <td><div class="slds-truncate"><ui:inputText aura:id="dynamicResult" class="pnsuggestion" value="{!Qli.Part_number_Suggestion__c}"/></div></td>
                   <!--<td><div class="slds-truncate">{!Qli.PN_Suggestion__c}</div></td>-->
                    <td><div class="slds-truncate"></div>
                    <lightning:button type="button" onclick="{!c.UpdatePnsuggestion}"   name="CMM Tooling and Accessories" label="{!sNo}">CMM Tooling and Accessories</lightning:button>
<lightning:button type="button" onclick="{!c.UpdatePnsuggestion}"  name="CMM Prewired" label="{!sNo}">CMM Prewired</lightning:button>
 </td>
                </tr>
          </aura:iteration>

UpdatePnsuggestion: function(component,event,helper){
   var va= event.getSource().get("v.name");
   var indexnumber= event.getSource().get("v.label");
  console.log(indexnumber);
    component.set("v.QliList.Part_number_Suggestion__c", va);
},