Rename index constant

db/migrate/20210429032320_add_escalation_rules.rb

@@ -3,13 +3,13 @@
 class AddEscalationRules < ActiveRecord::Migration[6.0]
   include Gitlab::Database::MigrationHelpers
 
-  RULE_PROJECT_INDEX_NAME = 'index_on_project_escalation_rule'
+  RULE_POLICY_INDEX_NAME = 'index_on_project_escalation_rule'
   RULE_SCHEDULE_INDEX_NAME = 'index_on_oncall_schedule_escalation_rule'
   UNIQUENESS_INDEX_NAME = 'index_on_policy_schedule_status_elapsed_time_escalation_rules'
 
   def change
     create_table :incident_management_escalation_rules do |t|
-      t.belongs_to :policy, index: { name: RULE_PROJECT_INDEX_NAME }, null: false, foreign_key: { on_delete: :cascade, to_table: :incident_management_escalation_policies }
+      t.belongs_to :policy, index: { name: RULE_POLICY_INDEX_NAME }, null: false, foreign_key: { on_delete: :cascade, to_table: :incident_management_escalation_policies }
       t.belongs_to :oncall_schedule, index: { name: RULE_SCHEDULE_INDEX_NAME }, null: false, foreign_key: { on_delete: :cascade, to_table: :incident_management_oncall_schedules }
       t.integer :status, null: false, limit: 2
       t.integer :elapsed_time, null: false, limit: 4