有谁能解释一下，在这个postgressql查询中，文本的矢量化似乎是不完整的？

with x as 
(
select 'the organic organization organizes organisms'::text as t,
to_tsvector('english','the organic organization organizes organisms'::text) tvect
)
SELECT t, 
left(ts_headline(t, 'organic'::tsquery), 100),
ts_rank_cd(tvect, 'organic'::tsquery)
 FROM x
WHERE (tvect @@ 'organic'::tsquery) 
order by ts_rank_cd(tvect, 'organic'::tsquery) desc;

在本例中，当我尝试按实际文本搜索“organic”时，搜索结果为空。