Sonata Admin DataGrid filter trying to use foreign text index

gist.php

<?php

protected function configureDatagridFilters(DatagridMapper $datagridMapper)
{
  /* Get the filtered tags */
  $repo = $this->getConfigurationPool()->getContainer()->get('repository.tag');
  $temp = $repo->findByType('job-role---buy-side');
  /* Work the results in to a choice compatible array  */
  $choices = array();
  foreach ($temp as $entry) { $choices[$entry->getTitle()] = $entry->getTitle(); }
  
  $datagridMapper
   ->add('buySideResponsibility', 'doctrine_mongo_callback', array(
  'callback' => function($queryBuilder, $alias, $field, $value) {
    if(!$value['value']) {
      return true;
    }
    $queryBuilder
    /* This is the referenceOne property that I would like to perform the text search on */
    ->field('buySideResponsibility')
    ->text('"'.$value['value'].'"');
    return true;
  }, 'field_type' => 'choice', 'field_options' => array(
  'choices' => $choices
  )))
}