Explicitly remove index by name

Relates to https://gitlab.com/gitlab-org/gitlab/issues/33084

db/migrate/20190805140353_remove_rendundant_index_from_releases.rb

@@ -12,10 +12,10 @@ class RemoveRendundantIndexFromReleases < ActiveRecord::Migration[5.2]
   disable_ddl_transaction!
 
   def up
-    remove_concurrent_index :releases, :project_id
+    remove_concurrent_index_by_name :releases, 'index_releases_on_project_id'
   end
 
   def down
-    add_concurrent_index :releases, :project_id
+    add_concurrent_index :releases, :project_id, name: 'index_releases_on_project_id'
   end
 end