Remove index as it will no longer be used

db/migrate/20190925054412_add_index_to_build_options.rb

-# frozen_string_literal: true
-
-class AddIndexToBuildOptions < ActiveRecord::Migration[5.2]
-  include Gitlab::Database::MigrationHelpers
-
-  DOWNTIME = false
-  INDEX_NAME = 'index_build_on_options'
-
-  disable_ddl_transaction!
-
-  def up
-    add_concurrent_index :ci_builds, :options,
-                         name: INDEX_NAME,
-                         using: :gist,
-                         opclass: :gist_trgm_ops,
-                         where: "options like '%:artifacts:%:reports:%:sast:%'" \
-                                " or options like '%:artifacts:%:reports:%:dast:%'" \
-                                " or options like '%:artifacts:%:reports:%:dependency_scanning:%'" \
-                                " or options like '%:artifacts:%:reports:%:container_scanning:%'"
-  end
-
-  def down
-    remove_concurrent_index_by_name :ci_builds, INDEX_NAME
-  end
-end

db/schema.rb

@@ -644,7 +644,6 @@ ActiveRecord::Schema.define(version: 2019_10_04_134055) do
     t.index ["commit_id", "type", "name", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_name_and_ref"
     t.index ["commit_id", "type", "ref"], name: "index_ci_builds_on_commit_id_and_type_and_ref"
     t.index ["name"], name: "index_ci_builds_on_name_for_security_products_values", where: "((name)::text = ANY (ARRAY[('container_scanning'::character varying)::text, ('dast'::character varying)::text, ('dependency_scanning'::character varying)::text, ('license_management'::character varying)::text, ('sast'::character varying)::text]))"
-    t.index ["options"], name: "index_build_on_options", opclass: :gist_trgm_ops, where: "((options ~~ '%:artifacts:%:reports:%:sast:%'::text) OR (options ~~ '%:artifacts:%:reports:%:dast:%'::text) OR (options ~~ '%:artifacts:%:reports:%:dependency_scanning:%'::text) OR (options ~~ '%:artifacts:%:reports:%:container_scanning:%'::text))", using: :gist
     t.index ["project_id", "id"], name: "index_ci_builds_on_project_id_and_id"
     t.index ["project_id", "status"], name: "index_ci_builds_project_id_and_status_for_live_jobs_partial2", where: "(((type)::text = 'Ci::Build'::text) AND ((status)::text = ANY (ARRAY[('running'::character varying)::text, ('pending'::character varying)::text, ('created'::character varying)::text])))"
     t.index ["project_id"], name: "index_ci_builds_on_project_id_for_successfull_pages_deploy", where: "(((type)::text = 'GenericCommitStatus'::text) AND ((stage)::text = 'deploy'::text) AND ((name)::text = 'pages:deploy'::text) AND ((status)::text = 'success'::text))"