FT._LIST command does not return an array of strings.
127.0.0.1:6379> ft._list
1) idx2
2) idx
3) idx3
127.0.0.1:6379> EVAL "return redis.pcall('ft.dropindex', redis.pcall('ft._list')[1])" 0
(error) ERR Lua redis lib command arguments must be strings or integers
However it looks like it should in the official Redis documentation.

FT._LIST command does not return an array of strings.
However it looks like it should in the official Redis documentation.
