Unable to update twitter typeahead.js prefetch fingerprint after boot

I use typeahead (0.10.1) in the application to return a list of clients using bloodhound prefetching. I cannot decide how to update / reinitialize the bloodhound with a new fingerprint, so that after a new client is inserted, it will use the new fingerprint and therefore enable the new client.

The system is ajax, so I can’t just change the name during the upgrade, I try to give it another fingerprint as shown in reinitializeclient () below, but it doesn’t work:

var clientthumbprint = "initialname";
var clients = new Bloodhound({ 
    limit: 5,
    prefetch:{
    url: '/urltofeed/',
    thumbprint:getthumbprint()
   },
  datumTokenizer: function(d) { 
  return Bloodhound.tokenizers.whitespace(d.label); 
},
  queryTokenizer: Bloodhound.tokenizers.whitespace
});
clients.initialize();

function reinitializeclient(newthumbprint){
  //This is called when a client is saved
  clientthumbprint = newthumprint;
  clients.initialize(); //this didn't work
}  

function getthumbprint(){
  return clientthumbprint;
}

$('#search_user').typeahead({
    minLength: 2,
  },
  {
   displayKey: 'label',
   source: clients.ttAdapter()
})

Anyone have any ideas what I'm doing wrong?

: head, pull, @jharding, reset, . :

function initialize_clients(){
  clients = new Bloodhound({ 
    limit: 5,
    prefetch:{
      url: '/pathtojson/',
      thumbprint:getthumbprint()
    },
    datumTokenizer: function(d) { 
      return Bloodhound.tokenizers.whitespace(d.label); 
    },
    queryTokenizer: Bloodhound.tokenizers.whitespace
  });
  clients.initialize();
};  

function resetclients(){    
  clientthumbprint = 'somenewthumbprint';
  clients.reset();//this works - after running nothing will return in search
  initialize_clients();//this is not working
}  

function getthumbprint(){
   return clientthumbprint;
}