<aura:attribute name="currentRecordDuns" type="String" />

({
doInit : function(component, event, helper) {
    helper.getAccounts(component);
},})

({
getAccounts: function(component) {
    var action = component.get("c.getAccounts");
    action.setParams({
        "currentDuns": component.get("v.currentRecordDuns"),
        "freeTextFilter": component.find("freeTextFilter").get("v.value")
    });
    //Set up the callback
    var self = this;
    action.setCallback(this, function(actionResult) {
        component.set("v.Accounts", actionResult.getReturnValue());
    });
    $A.enqueueAction(action);
},})

public class AccConListController {
@AuraEnabled
public static List<Account> getAccounts(String currentDuns,String freeTextFilter) {
    String q = 'SELECT Id, Name,DunsNumber, (select name, Phone, Email FROM Contacts where Name like '%' + freeTextFilter +  '%' or Phone like '%' + freeTextFilter +  '%' or Email like  '%' + freeTextFilter +  '%') FROM Account  where DunsNumber=:currentDuns';
    //q+= ' and Name like '%' + freeTextFilter +  '%'';
    List<Account> accounts= Database.query(q);
    return accounts;
}