How to show tooltips using a bootstrap sub-theme in a views filter?
form['title'] needed to be replaced with the fieldname without "filter-". 

function customisations_form_views_exposed_form_alter(&amp;$form) {
  //drupal_set_message("setting exposed filter tooltips", 'status');
  //dpm($form);
  $allFilter = array();
  $filtersList = array_keys($form['#info']);

for ($i =0; $i&lt;count($filtersList); $i++) {
    //drupal_set_message("filter " . $filtersList[$i], 'status');
    array_push($allFilter,$filtersList[$i]);
  }

  foreach ($allFilter as $field_name) {
    $fieldTitle = substr($field_name,7); //removes the filter-  
    $form[$fieldTitle]['#attributes'] = array(
    'data-toggle' =&gt; 'tooltip',
    'data-original-title' =&gt; $form['#info'][$field_name]['description']
  );
  $form['#info'][$field_name]['description'] = '';
}
}