GSK-2011 - ESRI:115813

WKT

VERTCS["GSK-2011", 
	DATUM["Geodezicheskaya_Sistema_Koordinat_2011", 
		SPHEROID["GSK-2011", 6378136.5, 298.2564151]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["GSK-2011", 
	DATUM["Geodezicheskaya_Sistema_Koordinat_2011", 
		ELLIPSOID["GSK-2011", 6378136.5, 298.2564151]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115813"]]

Data from @esri/proj-codes

{
  "wkid": 115813,
  "latestWkid": 115813,
  "macro": "PE_VCS_GSK_2011",
  "name": "GSK-2011",
  "wkt": "VERTCS[\"GSK-2011\",DATUM[\"Geodezicheskaya_Sistema_Koordinat_2011\",SPHEROID[\"GSK-2011\",6378136.5,298.2564151]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"GSK-2011\",DATUM[\"Geodezicheskaya_Sistema_Koordinat_2011\",ELLIPSOID[\"GSK-2011\",6378136.5,298.2564151]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115813\"]]",
  "description": "GSK-2011",
  "authority": "Esri",
  "version": "10.7.0",
  "deprecated": "no",
  "areaname": "Russia",
  "extent": {
    "slat": 39.87,
    "nlat": 85.19,
    "llon": 18.92,
    "rlon": -168.97
  }
}