How to read distance from Elasticsearch response - elasticsearch

Question

I am using Elasticsearch V6, NEST V6.
I am searching ES as below and I am using ScriptFields to calculate the distance and include it the result.
var searchResponse = _elasticClient.Search<MyDocument>(new SearchRequest<MyDocument>
{
Query = new BoolQuery
{
Must = new QueryContainer[] { matchQuery },
Filter = new QueryContainer[] { filterQuery },
},
Source = new SourceFilter
{
Includes = resultFields // fields to be included in the result
},
ScriptFields = new ScriptField
{
Script = new InlineScript("doc['geoLocation'].planeDistance(params.lat, params.lng) * 0.001") // divide by 1000 to convert to km
{
Lang = "painless",
Params = new FluentDictionary<string, object>
{
{ "lat", _center.Latitude },
{ "lng", _center.Longitude }
}
}
}
});
Now, I am trying to read the search result and I am not sure how to read the distance from the response, this is what I have tried:
// this is how I read the Document, all OK here
var docs = searchResponse.Documents.ToList<MyDocument>();
// this is my attempt to read the distance from the result
var hits = searchResponse.Hits;
foreach (var h in hits)
{
var d = h.Fields["distance"];
// d is of type Nest.LazyDocument
// I am not sure how to get the distance value from object of type LazyDocument
}
While debugging I can see the distance value, I am just not sure how to read the value?

Answer 1

I found the answer here
To read search document and distance:
foreach (var hit in searchResponse.Hits)
{
MyDocument doc = hit.Source;
double distance = hit.Fields.Value<double>("distance");
}
And if you are only interested in distance:
foreach (var fieldValues in searchResponse.Fields)
{
var distance = fieldValues.Value<double>("distance");
}