Translator plugin ERROR: relation "idx_on_topic_id_locale_70b2f83213" already exists

How do we enable the translator plugin?

When we tried to rebuild the app last month with Discourse translator plugin, it failed with this line
ERROR: relation “idx_on_topic_id_locale_70b2f83213” already exists

we had to remove the translator plugin.

This time, it’s failing with
ERROR: could not create unique index “idx_on_post_id_locale_0cc3d81e5b”