Implementing Terrain service from Geoserver to cesiumjs

Hi everyone, I was trying to use wms service from geoserver of ortho files that I am able to use perfectly. Now, I want to publish terrain service from geoserver of DEM files and want to use it into cesiumjs but I am unable to use terrain service of geosever into cesiumjs. Please help me, how to use terrain service from geoserver to cesiumjs?

Thank you