To accomplish this, I added the following bit of code to the qa-eqf-event.php file after the line qa_db_postmeta_set($params['postid'], 'qa_q_'.$name, $content);
$contentcount=array_count_values(qa_string_to_words($content));
// Map all words to their word IDs
$words=array_unique(array_keys($contentcount));
$wordtoid=qa_db_word_mapto_ids_add($words);
// Add to content words index (including word counts)
$contentwordidcounts=array();
foreach ($contentcount as $word => $count)
if (isset($wordtoid[$word]))
$contentwordidcounts[$wordtoid[$word]]=$count;
qa_db_contentwords_add_post_wordidcounts($params['postid'], 'Q', $params['postid'], $contentwordidcounts);
This allows any of the Extra Fields sections to be searchable. However, this will not allow old posts Extra Fields to be searchable, only new posts from the time of adding this code.