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The Chinese compatible tokenizer is like the simple tokenizer — it lowercases non-CJK characters and splits on any non-alphanumeric character. Additionally, it treats each CJK character as its own token. 
CREATE INDEX search_idx ON mock_items
USING bm25 (id, (description::pdb.chinese_compatible))
WITH (key_field='id');
To get a feel for this tokenizer, run the following command and replace the text with your own: 
SELECT 'Hello world! 你好!'::pdb.chinese_compatible::text[];
Expected Response
        text
---------------------
 {hello,world,你,好}
(1 row)