http://stackoverflow.com/questions/16401545/find-all-filtered-by-nested-in-elasticsearch/16406145

ofertas.sh

curl -XDELETE localhost:9200/test-idx
curl -XPUT localhost:9200/test-idx -d '{
    "mappings": {
        "ofertas": {
            "properties": {
                "idtipooa": {
                    "type": "nested",
                    "properties": {
                        "nombre": {"type": "string", "index": "not_analyzed" }
                    }
                }
            }
        }
    }
}'
echo
curl -XPUT localhost:9200/test-idx/ofertas/3 -d '{
    "id": 3,
    "nombreoa": "Abogacia",
    "titulo": "Abogado",
    "idtipooa": {
        "nombre": "Carrera Universitaria"
    }
}'
echo
curl -XPOST localhost:9200/test-idx/_refresh
echo
echo
echo '== Searching for "Universitaria" - no results =='
curl -XPOST "localhost:9200/test-idx/ofertas/_search?pretty=true" -d '{
    "query": {
        "filtered": {
            "query": {
                "match_all": {}
            },
            "filter": {
                "nested": {
                    "path": "idtipooa",
                    "query": {
                        "bool": {
                            "must": [{
                                "match": {
                                    "idtipooa.nombre": "Universitaria"
                                }
                            }]
                        }
                    },
                    "_cache": true
                }
            }
        }
    }
}'
echo
echo
echo '== Searching for "Carrera Universitaria" - one result =='
curl -XPOST "localhost:9200/test-idx/ofertas/_search?pretty=true" -d '{
    "query": {
        "filtered": {
            "query": {
                "match_all": {}
            },
            "filter": {
                "nested": {
                    "path": "idtipooa",
                    "query": {
                        "bool": {
                            "must": [{
                                "match": {
                                    "idtipooa.nombre": "Carrera Universitaria"
                                }
                            }]
                        }
                    },
                    "_cache": true
                }
            }
        }
    }
}'

Finally I got it. The mapping was wrong. It should be like that:

=> #<Elasticsearch::Model::Indexing::Mappings:0x0000010fb120a0
 @mapping=
  {:user=>{:type=>"object", :properties=>{:name=>{:type=>"string"}}},
   :reservation=>
    {:type=>"nested",
     :properties=>
      {:time_start=>{:type=>"string"},
       :service_location_lane=>
        {:type=>"object", :properties=>{:name=>{:type=>"string"}}}}}},
 @options={},
 @type="employee_reservation">