Aggregations using filtering

aggs.json

DELETE /hotels

POST /hotels/hotel/_bulk
{ "index" : { "_id" : 1 }}
{ "features": [ "wifi", "parking" ], "stars" : 1 }
{ "index" : { "_id" : 2 }}
{ "features": [ "pool", "parking" ], "stars" : 4 }
{ "index" : { "_id" : 3 }}
{ "features": [ "wifi", "pool" ], "stars" : 5 }


GET /hotels/_search
{
  "query": {
    "match_all": {}
  }, 
  "aggs": {
    "stars": {
      "terms": {
        "field": "stars",
        "size": 10
      }
    },
    "features": {
      "terms": {
        "field": "features",
        "size": 10
      }
    }
  }
}

GET /hotels/_search
{
  "query": {
    "match_all": {}
  }, 
  "post_filter": {
    "term": {
      "features": "wifi"
    }
  }, 
  "aggs": {
    "stars": {
      "terms": {
        "field": "stars",
        "size": 10
      }
    },
    "features": {
      "terms": {
        "field": "features",
        "size": 10
      }
    }
  }
}

GET /hotels/_search
{
  "query": {
    "bool": {
      "filter": {
        "term": {
          "features": "wifi"
        }
      }
    }
  },
  "aggs": {
    "stars": {
      "terms": {
        "field": "stars",
        "size": 10
      }
    },
    "features": {
      "terms": {
        "field": "features",
        "size": 10
      }
    }
  }
}

GET /hotels/_search
{
  "query": {
    "match_all": {}
  },
  "aggs": {
    "stars": {
      "filter": {
        "term": {
          "features": "wifi"
        }
      },
      "aggs": {
        "terms_agg": {
          "terms": {
            "field": "stars",
            "size": 10
          }
        }
      }
    },
    "features": {
      "terms": {
        "field": "features",
        "size": 10
      }
    }
  }
}

PUT /hotels/.hotel/1
{ "a":"b" }