Recreate Tables should Recreate indexes on MySQL

The MySQL indexes are not being renamed at the same time as RENAME table despite the
CASCADE. Therefore it is probably better to just recreate the indexes instead.

Signed-off-by: Andrew Thornton <art27@cantab.net>

models/migrations/migrations.go

@@ -597,11 +597,26 @@ func recreateTable(sess *xorm.Session, bean interface{}) error {
 			return err
 		}
 
+		if err := sess.Table(tempTableName).DropIndexes(bean); err != nil {
+			log.Error("Unable to drop indexes on temporary table %s. Error: %v", tempTableName, err)
+			return err
+		}
+
 		// SQLite and MySQL will move all the constraints from the temporary table to the new table
 		if _, err := sess.Exec(fmt.Sprintf("ALTER TABLE `%s` RENAME TO `%s`", tempTableName, tableName)); err != nil {
 			log.Error("Unable to rename %s to %s. Error: %v", tempTableName, tableName, err)
 			return err
 		}
+
+		if err := sess.Table(tableName).CreateIndexes(bean); err != nil {
+			log.Error("Unable to recreate indexes on table %s. Error: %v", tableName, err)
+			return err
+		}
+
+		if err := sess.Table(tableName).CreateUniques(bean); err != nil {
+			log.Error("Unable to recreate uniques on table %s. Error: %v", tableName, err)
+			return err
+		}
 	case setting.Database.UsePostgreSQL:
 		var originalSequences []string
 		type sequenceData struct {