If you have a duplicate FulltextSearch::enable() in your site or any of your module, it generates the below error on dev/build:
Uncaught SilverStripe\ORM\Connect\DatabaseException: Couldn't run query: ALTER TABLE "File" DROP INDEX "SearchFields", ADD fulltext "SearchFields" ("Name","Title","Name","Title") 42S21-1060: Duplicate column name 'Name'