"Asset managers have brought to the market certain products reflecting one or more ESG factors and constructed around the thesis that these products will outperform other investments in their asset category, and have developed research and other materials in support of that thesis.... While it continues to be the case that ESG investing by ERISA plans has generally not proven to be controversial in actual practice, with very little litigation experience to date, investigations into ESG investing by specific plans and investment firms are in progress in various DOL Regional Offices[.]"