elasticsearch get specific fields - elasticsearch

Question

I am trying to search data from following indexed data
PUT /nested_test100/t/1
{
"title": "Nest eggs1",
"body": "Making your money work...",
"tags": [ "cash1", "shares1" ],
"comments": [
{
"name": "John Smith1",
"comment": "Great article1",
"age": 28,
"stars": 1,
"date": "2014-09-01"
},
{
"name": "Alice White1",
"comment": "More like this please1",
"age": 31,
"stars": 1,
"date": "2014-10-22"
}
]
}
PUT /nested_test100/t/2
{
"title": "Nest eggs2",
"body": "Making your money work...",
"tags": [ "cash", "shares" ],
"comments": [
{
"name": "John Smith2",
"comment": "Great article2",
"age": 30,
"stars": 2,
"date": "2014-09-01"
},
{
"name": "Alice White2",
"comment": "More like this please2",
"age": 31,
"stars": 2,
"date": "2014-10-22"
}
]
}
PUT /nested_test100/t/3
{
"title": "Nest eggs3",
"body": "Making your money work...",
"tags": [ "cash3", "shares3" ],
"comments": [
{
"name": "John Smith3",
"comment": "Great article3",
"age": 28,
"stars": 3,
"date": "2014-09-01"
},
{
"name": "Alice White3",
"comment": "More like this please3",
"age": 30,
"stars": 3,
"date": "2014-10-22"
}
]
}
GET /nested_test100/t/_search
what I want is to get title, body tags only and only comments having age=28.
How I should write query dsl for that.
what I have written is following
POST /nested_test100/t/_search
{
"fields" : ["title","comments.age","body","tags"],
"query" : {
"term" : { "comments.age" : "28" }
}
}
and its giving me data like this
"hits": [
{
"_index": "nested_test100",
"_type": "t",
"_id": "1",
"_score": 1,
"fields": {
"comments.age": [
28,
31
],
"title": [
"Nest eggs1"
],
"body": [
"Making your money work..."
],
"tags": [
"cash1",
"shares1"
]
}
},
{
"_index": "nested_test100",
"_type": "t",
"_id": "3",
"_score": 1,
"fields": {
"comments.age": [
28,
30
],
"title": [
"Nest eggs3"
],
"body": [
"Making your money work..."
],
"tags": [
"cash3",
"shares3"
]
}
}
]
but I don't want comments having age other than 28.
I am using elasticsearch version 1.7

Answer 1

Please use inner_hits to include nested inner objects as inner hits to a search hit.
The search request would be like :
POST test/_search
{
"query": {
"nested": {
"path": "comments",
"query": {
"match": {"comments.age" : 28}
},
"inner_hits": {}
}
}
}
P.S : You will need to map the comments as a nested field (as already mentioned by Val)