The Maine Retirement System, Augusta, is considering adding domestic growth equity to its index funds and eventually might search for a manager for that assignment. Trustees will meet Nov. 14 to discuss the possibility, said Claude Perrier, executive director of the $4.2 billion fund. Trustees might decide to give the growth assignment to PanAgora, which already manages the fund's other passive investments, or search for another manager. Passive stock and bond funds make up close to half the fund. Assets for the growth index fund would come from reductions in allocations to existing active equity managers; none would be terminated.