I've got the same error, although I'm running galera cluster with 3 nodes. I tried following the instructions from InnoDB: Error: Table "mysql"."innodb_table_stats" not found after upgrade to mysql 5.6 but when I get to the step of running the create statements, I get the following error:
Error Code: 1813. Tablespace for table '`mysql`.`innodb_index_stats`' exists. Please DISCARD the tablespace before IMPORT.
This made no sense to me, and when I tried to use
drop tablespace `innodb_index_stats`;
I got an SQL sysntax error.