Migration to MySQL 5.7.4 failure

2014-09-19 22:36:45,687 INFO  [ThreadPool1 ] fisheye DefaultDBControl-stop - Shutdown in progress...
2014-09-19 22:36:45,688 INFO  [ThreadPool1 ] fisheye HibernateUtil-destroy - Shutting down DB.
2014-09-19 22:37:02,345 ERROR [ThreadPool1 ] fisheye DBEditHelper-doGet - Database migration failed: com.cenqua.crucible.hibernate.CruDBException: Problem with constraints script /Users/foong/Desktop/CustomWare/fisheye/fecru-3.5.3/sql/MYSQL/schema/constraints_87.sql
com.cenqua.crucible.hibernate.CruDBException: Problem with constraints script /Users/foong/Desktop/CustomWare/fisheye/fecru-3.5.3/sql/MYSQL/schema/constraints_87.sql
	at com.cenqua.crucible.hibernate.DefaultDBControl.addConstraints(DefaultDBControl.java:411)
	at com.atlassian.crucible.migration.item.DBImporter.importData(DBImporter.java:145)
	at com.atlassian.crucible.actions.admin.database.DBEditHelper$ImportRunner.call(DBEditHelper.java:93)
	at com.atlassian.crucible.actions.admin.database.DBEditHelper$ImportRunner.call(DBEditHelper.java:75)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:744)
Caused by: com.cenqua.crucible.hibernate.CruDBException: SQL script error on line 19: "alter table cru_changeset_comment add index FK1C588BB9A697BC70 (cru_user_id), add constraint FK1C588BB9A697BC70 foreign key (cru_user_id) references cru_user (cru_user_id);" 
(Duplicate index 'FK1C588BB9A697BC70' defined on the table 'fecru353.cru_changeset_comment'. This is deprecated and will be disallowed in a future release.), please contact http://www.atlassian.com/support/
	at com.cenqua.crucible.hibernate.DefaultDBControl.executeScript(DefaultDBControl.java:593)
	at com.cenqua.crucible.hibernate.DefaultDBControl.executeScript(DefaultDBControl.java:524)
	at com.cenqua.crucible.hibernate.DefaultDBControl.addConstraints(DefaultDBControl.java:405)
	... 9 more
Caused by: java.sql.SQLException: Duplicate index 'FK1C588BB9A697BC70' defined on the table 'fecru353.cru_changeset_comment'. This is deprecated and will be disallowed in a future release.
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)