Global Search and Textarea Fields / Text Area

I added a bunch of custom fields to global search, all worked fine except the one field that was of type textarea. So can you not add custom textarea fields to global search or did I do it wrong?

In custom/Extention/modules/Cases/Ext/Vardefs/sugarfield_notes_c.php


In custom/modules/Cases/metadata/SearchFields.php

‘notes_c’ =>
array (
‘query_type’ => ‘default’,