Here's one of the queries Joomla spat out after I performed a search for "ammo" (without the quotes):
SELECT a.product_id AS id, a.product_name AS title, a.product_created AS created , a.product_description AS text, "1" AS browsernav
FROM jos_hikashop_product AS a
WHERE a.product_published=1
AND a.product_type='main'
AND ((a.product_name LIKE '%ammo%')) OR ((a.product_description LIKE '%ammo%'))
ORDER BY a.product_modified DESC
LIMIT 0, 50
It looks to me like Joomla triggered the plugin fine... I can see my search string in there.