So-called smart-beta strategies have overrun the world of equity exchange-traded funds as investors seek ways to spice up their boring old index funds. Now a pair of new bond ETFs from IndexIQ are getting into the act by adding a little "momentum" to their portfolios. Earlier this month IndexIQ, which is owned by MainStay Investments, released the IQ Enhanced Core Bond US ETF and the IQ Enhanced Core Plus Bond US ETF . The AGGE tracks the IQ Enhanced Core Bond U.S.