Remove index on file_type

db/migrate/20170918072948_create_job_artifacts.rb

@@ -6,8 +6,8 @@ class CreateJobArtifacts < ActiveRecord::Migration
   def change
     create_table :ci_job_artifacts do |t|
       t.belongs_to :project, null: false, index: true, foreign_key: { on_delete: :cascade }
-      t.integer :job_id, null: false, index: true
-      t.integer :file_type, null: false, index: true
+      t.integer :job_id, null: false
+      t.integer :file_type, null: false
       t.integer :size, limit: 8
 
       t.datetime_with_timezone :created_at, null: false

db/migrate/20170918072949_add_file_store_job_artifacts.rb

@@ -6,9 +6,6 @@ class AddFileStoreJobArtifacts < ActiveRecord::Migration
 
   def up
     add_column(:ci_job_artifacts, :file_store, :integer)
-
-    # Run on an empty table, but else Rubocop is not happy
-    add_concurrent_index(:ci_job_artifacts, :file_store)
   end
 
   def down

db/schema.rb

@@ -408,10 +408,7 @@ ActiveRecord::Schema.define(version: 20171130145523) do
     t.integer "file_store"
   end
 
-  add_index "ci_job_artifacts", ["file_store"], name: "index_ci_job_artifacts_on_file_store", using: :btree
-  add_index "ci_job_artifacts", ["file_type"], name: "index_ci_job_artifacts_on_file_type", using: :btree
   add_index "ci_job_artifacts", ["job_id", "file_type"], name: "index_ci_job_artifacts_on_job_id_and_file_type", unique: true, using: :btree
-  add_index "ci_job_artifacts", ["job_id"], name: "index_ci_job_artifacts_on_job_id", using: :btree
   add_index "ci_job_artifacts", ["project_id"], name: "index_ci_job_artifacts_on_project_id", using: :btree
 
   create_table "ci_pipeline_schedule_variables", force: :cascade do |t|