How to get total score specific to each row - elasticsearch

Question

I need, Elasticsearch GET query to view the total score of each and every students by adding up the marks earned by them in all the subject rather I am getting total score of all the students in every subject.
GET /testindex/testindex/_search
{
"query" : {
"filtered" : {
"query" : {
"match_all" : {}
}
}
},
"aggs": {
"total": {
"sum": {
"script" : "doc['physics'].value + doc['maths'].value + doc['chemistry'].value"
}
}
}
}
Output
{
....
"hits": [
{
"_index": "testindex",
"_type": "testindex",
"_id": "1",
"_score": 1,
"_source": {
"personalDetails": {
"name": "viswa",
"age": "33"
},
"marks": {
"physics": 18,
"maths": 5,
"chemistry": 34
},
"remarks": [
"hard working",
"intelligent"
]
}
},
{
"_index": "testindex",
"_type": "testindex",
"_id": "2",
"_score": 1,
"_source": {
"personalDetails": {
"name": "bob",
"age": "13"
},
"marks": {
"physics": 48,
"maths": 45,
"chemistry": 44
},
"remarks": [
"hard working",
"intelligent"
]
}
}
]
},
"aggregations": {
"total": {
"value": 194
}
}
}
Expected Output:
I would like to get total mark earned in subjects of each and every student rather than total of all the students.
What changes I need to do in the query to achieve this.

Answer 1

{
"query": {
"filtered": {
"query": {
"match_all": {}
}
}
},
"aggs": {
"student": {
"terms": {
"field": "personalDetails.name",
"size": 10
},
"aggs": {
"total": {
"sum": {
"script": "doc['physics'].value + doc['maths'].value + doc['chemistry'].value"
}
}
}
}
}
}
But, be careful, for student terms aggregation you need a "unique" (something that makes that student unique - like a personal ID or something) field, maybe the _id itself, but you need to store it.