FIX delet some index with projects table

db/migrate/20201023025821_remove_index_from_projects.rb

@@ -0,0 +1,7 @@
+class RemoveIndexFromProjects < ActiveRecord::Migration[5.2]
+  def change
+    remove_index :projects, :project_language_id
+    remove_index :projects, :project_category_id
+    remove_index :projects, :user_id
+  end
+end