nested_example.json

DELETE /test

PUT /test
{
    "mappings": {
        "person": {
            "properties": {
                "name": { "type": "string" },
                "attributes": {
                    "type": "nested",
                    "properties": {
                        "name":  { "type": "string", "index": "not_analyzed" },
                        "value": { "type": "string", "index": "not_analyzed" }
                    }
                }
            }
        }
    }
}

PUT /test/person/1
{
    "name": "Adrien Grand",
    "attributes": [
        {
            "name": "height",
            "value": "180cm"
        }
    ]
}

PUT /test/person/2
{
    "name": "John Smith",
    "attributes": [
        {
            "name": "height",
            "value": "185cm"
        },
        {
            "name": "weight",
            "value": "82kg"
        }
    ]
}

POST /test/_refresh

GET /test/person/_search
{
    "aggs": {
        "attributes": {
            "nested": {
                "path": "attributes"
            },
            "aggs": {
                "name_counts": {
                    "terms": {
                        "field": "attributes.name"
                    }
                }
            }
        }
    }
}