How to group results in elasticsearch?

Question

I am storing Book Titles in elasticsearch and they all belong to many shops. Like this:

{
    \"books\": [
        {
            \"id\": 1,
            \"tit         


        

Answer 1

You can implement above desired result using Aggregation in aggregation with top_hits aggs. ex.

aggs: {
        "set": {
            "terms": {
                field: "id"
            },
            "aggs": {
                "color": {
                    "terms": {
                        field: "color"
                    },
                    "aggs": {
                        "products": {
                            "top_hits": {
                                _source:{
                                    "include":["size"]
                                }
                            }
                        }
                    }
                },
                "product": {
                    "top_hits": {
                        _source:{
                            "include":["productDetails"]
                        },
                        size: 1
                    }
                }
            }
        }
    }