This usually means that the traditional bearings have been replaced by 'elastomeric' (rubber-metal laminate) bearings that flex to accommodate the feathering, flapping and lead-lag rather than use rolling elements. Very popular with Airbus and Bell.
The main player in the field is Lord:
See Here
In the rotorway, I believe the 'elastomeric bearing' purely handles feathering and is basically a stack of rubber and metallic discs on a central shaft.
CRAN