How to search in ElasticSearch nested objects using NEST

Try to use nested query.

Let me index some data for test purpose:

client.Index(new Person{    Id = 1,     Car = new List<NestedType> {new NestedType {Carname = "car1"}}});client.Index(new Person{    Id = 2,    Car = new List<NestedType> {new NestedType {Carname = "car1"}, new NestedType {Carname = "car2"}}});client.Index(new Person{    Id = 3,    Car = new List<NestedType> { new NestedType {Carname = "car2"}}});client.Refresh();

Now, try this nested query:

var searchResponse = client.Search<Person>(s =>    s.Query(q => q        .Nested(n => n            .Path(p => p.Car)            .Query(qq => qq.Match(m => m.OnField(f => f.Car.First().Carname).Query("car2"))))));

Search result:

{   "took": 10,   "timed_out": false,   "_shards": {..},   "hits": {      "total": 2,      "max_score": 1.4054651,      "hits": [         {            "_index": "my_index",            "_type": "person",            "_id": "2",            "_score": 1.4054651,            "_source": {               "id": 2,               "car": [                  {                     "carname": "car1",                     "carNo": 0                  },                  {                     "carname": "car2",                     "carNo": 0                  }               ]            }         },         {            "_index": "my_index",            "_type": "person",            "_id": "3",            "_score": 1,            "_source": {               "id": 3,               "car": [                  {                     "carname": "car2",                     "carNo": 0                  }               ]            }         }      ]   }}

Hope it helps you.

UPDATE

Including your formatting:

var searchResponse = client.Search<person>(s =>    s.Query(q => q        .Nested(n => n            .Path(p => p.car)            .Query(qq => qq.Match(m => m.OnField(f => f.car.First().carname).Query("car2"))))));

UPDATE2

Based on your update, try this query:

var searchResponse = client.Search<Person>(s => s    .Query(query => query.Filtered(filtered => filtered        .Query(q => q.MatchAll())        .Filter(f => f.Nested(nf => nf            .Path(p => p.Car)            .Filter(filter => filter                .And(                    f1 => f1.Term(t => t.Car.First().Carname, "audi"),                    f2 => f2.Term(t => t.Car.First().Color, "purple")))             )))));

which produces this query to elasticsearch:

{  "query": {    "filtered": {      "query": {        "match_all": {}      },      "filter": {        "nested": {          "filter": {            "and": {              "filters": [                {                  "term": {                    "car.carname": "audi"                  }                },                {                  "term": {                    "car.color": "purple"                  }                }              ]            }          },          "path": "car"        }      }    }  }}

UPDATE3

With inner hits:

var searchResponse = client.Search<Person>(s => s    .Source(false)    .Query(query => query.Filtered(filtered => filtered        .Query(q => q.MatchAll())        .Filter(f => f.Nested(nf => nf            .InnerHits()            .Path(p => p.Car)            .Filter(filter => filter                .And(                    f1 => f1.Term(t => t.Car.First().Carname, "audi"),                    f2 => f2.Term(t => t.Car.First().Color, "purple")))            )))));

Note: there was bug in elasticsearch 1.5.0 regarding inner hits and filter. Have a look.Let me know if you need help with retrieving inner hits.