MySQL FullText search on string shorter than 3 chars returns no rows
Setting ft_min_word_len only affects MyISAM.

You need to set innodb_ft_min_token_size to 1 since the default is 3.

Once you set innodb_ft_min_token_size to 1, go back and do

ALTER TABLE addresses DROP INDEX address_index
CREATE FULLTEXT INDEX address_index ON addresses(street);


Give it a Try !!!