My sql do alter table on production -Percona's

 pt-online-schema-change \

  --alter "ADD INDEX idx_project_doc_filter (

    external_app_id,

    user_id,

    date_created DESC,

    design_name,

    subject_folder_id,

    listing_id,

    date_updated

  )" \

  --user=your_user \

  --password=your_pass \

  --host=your_host \

  --execute