Version 1.6.2 had a critical bug that prevents indexing the database. 1.6.2.1 fixes the bug.
Utf8mb4 charset and index problems
If you use utf8mb4 charset, Relevanssi database table may be missing an index. That’s because part of the index includes a column type that is of varchar(210) type. This is fine with utf8, but fails for utf8mb4, which only allows columns 191 characters long (because maximum column size is 767…