Find the count of nested field

Elastic Stack Elasticsearch
1

My document "abc" is in the below format,

{
"name": "abc",
"age": 25,
"sub": [
{
"sub_id": 12,
"sub": "english",
"mark": 89
},
{
"sub_id": 13,
"sub": "science",
"mark": 99
},
{
"sub_id": 14,
"sub": "maths",
"mark": 100
}
]
}

From the above json I need to get the count of sub_id [e.g., count(sub_id) = 3] for a specific json document. Can anyone tell me the elastic search query to get the count. Like GET es_stud/subject/_search

2

You want to get a total of however many times a sub_id is mentioned in a doc?

3

Yes @warkolm I want to get total count of sub_id in a document.