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

Question

I am trying to create a function_score elasticsearch query using NEST (gauss function), and have a geo point object to pass as the 'origin', however the "Origin" method in NEST accepts only a string, a result elasticsearch can't parse the query.
How can I write the query in NEST so Elasticsearch can parse it 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 the code above to elasticsearch like this, which elasticsearch can't parse (origin is parsed as string).
"query": {
"function_score": {
"functions": [
{
"gauss": {
"geoCenter": {
"origin": "{\"lat\":29.745703,\"lon\":-95.740514}", //<-- string
"scale": "500m",
"offset": "1km",
"decay": 0.99
}
}
}
]
}
}
Below is the correct query that Elasticsearch can run (origin is parsed as 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
}
}
}
]
}

Answer 1

i have something like this in my 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;