Missing check for fact_values_string_trgm

The code for index handling was only checking one index, but not the other.
This corrects the logic, and drops and extra INFO when creating the new index.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #1097 from kbarber/maint/stable/missing-check-for-fact_values_string_trgm

Missing check for fact_values_string_trgm