You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 20180824162828_fix_teacher_discipline_classrooms_indexes2.rb
    path of file: ./repos/i-diario/db/migrate
    
    the code of the file until where you have to start completion: class FixTeacherDisciplineClassroomsIndexes2 < ActiveRecord::Migration[4.2]
  disable_ddl_transaction!

  def change
    remove_index :te
    
  def change
    remove_index :teacher_discipline_classrooms, name: :idx_teacher_discipline_classrooms_all_fks, algorithm: :concurrently
    remove_index :teacher_discipline_classrooms, name: :idx_teacher_discipline_classrooms_two_fks, algorithm: :concurrently
    remove_index :teacher_discipline_classrooms, column: [:discipline_id], where: "deleted_at IS NULL", algorithm: :concurrently
    remove_index :teacher_discipline_classrooms, column: [:classroom_id], where: "deleted_at IS NULL", algorithm: :concurrently
    remove_index :teacher_discipline_classrooms, column: [:teacher_id], where: "deleted_at IS NULL", algorithm: :concurrently

    add_index :teacher_discipline_classrooms, [:discipline_id, :classroom_id, :teacher_id], name: :idx_teacher_discipline_classrooms_all_fks, algorithm: :concurrently
    add_index :teacher_discipline_classrooms, [:discipline_id, :teacher_id], name: :idx_teacher_discipline_classrooms_two_fks, algorithm: :concurrently
    add_index :teacher_discipline_classrooms, :discipline_id, algorithm: :concurrently
    add_index :teacher_discipline_classrooms, :classroom_id, algorithm: :concurrently
    add_index :teacher_discipline_classrooms, :teacher_id, algorithm: :concurrently
  end