in order to proceed i had to manually remove indexes on some of my token tables
ALTER TABLE lime_tokens_11324 DROP INDEX idx_lime_tokens_11324_efl;
ALTER TABLE lime_tokens_37624 DROP INDEX idx_lime_tokens_37624_efl;
ALTER TABLE lime_tokens_77686 DROP INDEX idx_lime_tokens_77686_efl;
ALTER TABLE lime_tokens_79415 DROP INDEX idx_lime_tokens_79415_efl;
ALTER TABLE lime_tokens_92878 DROP INDEX idx_lime_tokens_92878_efl;

note only some of my token tables had multiple indexes on them.
this was caused by upgradedb_helper::upgradeTokenTables179 setting the last name field