*MySQL Manual - Chapter 12.7.4. Full-Text Restrictions* says: *Full-text searches are supported for MyISAM tables only. *
You could try to do what i did... with some overhead... I also had InnoDB tables for an application and also was in a great need of Full-Text Searches. I made a mirror MyISAM table but with the full text index. The full text searches were performed on the MyISAM tables. The inserts were done on both tables. Now depending on the size of the tables you have to do a sync. of the tables or complete reconstruction of the MyISAM table. Despite the fact that inserts were done on the both tables I also did a sync. every Sunday ( I had the smallest traffic on Sundays) and a complete reconstruction of the table every 2 months... ( MyISAM table - is now 750 MB ) The system is working fine for about 16 months now ! -- Gabriel PREDA Senior Web Developer