ElasticSearch Aggregation Buckets

[chuntley]

The current ElasticSearch implementation of aggregations is missing the ability to group aggregations into buckets. As stated on their documentation (http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/search-aggregations.html):

A family of aggregations that build buckets, where each bucket is associated with a key and a document criterion. When the aggregation is executed, all the buckets criteria are evaluated on every document in the context and when a criterion matches, the document is considered to "fall in" the relevant bucket. By the end of the aggregation process, we’ll end up with a list of buckets - each one with a set of documents that "belong" to it.

A simple implementation of this is returning aggregation results by day, for example:

{
  "size": 0,
  "query": {
    "filtered": {
      "filter": {
        "bool": {
          "must": [
            {
              "range": {
                "log_timestamp": {
                  "from": "2014-10-01",
                  "to": "2014-10-30"
                }
              }
            }
          ]
        }
      }
    }
  },
  "aggregations": {
    "by_day": {
      "date_histogram": {
        "field": "timestamp",
        "interval": "day"
      },
      "aggregations": {
        "run_time": {
          "avg": {
            "field": "run_time"
          }
        }
      }
    }
  }
}

Adding the ability to have parent/children in addAgg() should be sufficient for adding aggregation buckets.

[yii-bot]

Issue moved to yiisoft/yii2-elasticsearch#59