How get a distinct list of document fields using NEST? - elasticsearch

Question

I have just started with Elasticsearch and am using the NEST API for my .Net application. I have an index and some records inserted. I am now trying to get a distinct list of document field values. I have this working in Postman. I do not know how to port the JSON aggregation body to a NEST call. Here is the call I am trying to port to the NEST C# API:
{
"size": 0,
"aggs": {
"hosts": {
"terms": {
"field": "host"
}
}
}
Here is the result which is my next question. How would I parse or assign a POCO to the result? I am only interested in the distinct list of the field value in this case 'host'. I really just want an enumerable of strings back. I do not care about the count at this point.
{
"took": 0,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 3,
"relation": "eq"
},
"max_score": null,
"hits": []
},
"aggregations": {
"hosts": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
{
"key": "hoyt",
"doc_count": 3
}
]
}
}
}

Answer 1

I was able to get the results I am after with the following code:
var result = await client.SearchAsync<SyslogEntryIndex>(s => s.Size(0).Aggregations(a => a.Terms("hosts", t => t.Field(f => f.Host))));
List<string> hosts = new List<string>();
foreach (BucketAggregate v in result.Aggregations.Values)
{
foreach (KeyedBucket<object> item in v.Items)
{
hosts.Add((string)item.Key);
}
}
return hosts;