elasticsearch net - How to pass an object to "Origin" method in NEST (FunctionScore query)? -

i trying create function_score elasticsearch query using nest (gauss function), , have geo point object pass 'origin', "origin" method in nest accepts string, result elasticsearch can't parse query. how can write query in nest elasticsearch can parse correctly?

var originloc = jsonconvert.serializeobject(userlocation.geocenter); var searchdesc = new searchdescriptor<mycustomtype>().query(q => q.functionscore(fs => fs.functions(func => func.gauss("geocenter", gs => gs.origin(originloc).offset("1km").scale("500m").decay(0.99))))); 

nest passes code above elasticsearch this, elasticsearch can't parse (origin parsed string).

"query": { "function_score": {   "functions": [     {       "gauss": {         "geocenter": {           "origin": "{\"lat\":29.745703,\"lon\":-95.740514}", //<-- string           "scale": "500m",           "offset": "1km",           "decay": 0.99         }       }     }   ] } 

}

below correct query elasticsearch can run (origin parsed geo point object)

"query": { "function_score": {   "functions": [     {       "gauss": {         "geocenter": {           "origin": {  //<----- geo point serialized object             "lon": -95.740514,             "lat": 29.745703           },           "scale": "500m",           "offset": "1km",           "decay": 0.99         }       }     }   ] } 

i have in code

.query(f => f         .functionscore(fs => fs                         .boostmode(functionboostmode.sum)                         .functions(ff => ff                             .linear("location", d => d.origin(origin).scale("8km").decay(0.33))                         )         ) ) 

where origin -> var origin = object.latitude + "," + object.longitude;