Faceted Search and Aggregations Do Not Work Properly

Question

I have an index for a Store with a type for Items, i.e. /store/items.
among other properties, Items have a Title (analyzed text), a Description (analyzed text), and Tags (not_analyzed text).

I want to be able to show the facets over Tags with counts, so if a facet of the Tag "Yellow" has a count of 12, for example, then when the user adds that Tag to the filter she will see only 12 items.

I am using a Filtered Query with Aggs, as shown below, on Elasticsearch 1.1.1 on a single node:

GET _search {
  "query": {
    "filtered": {
      "query": {
        "multi_match": {
          "query": "Large Widgets",
          "fields": [
            "title^3",
            "description"
          ]
        }
      },
      "filter": {
        "terms": {
          "tags": [
            "Colorful"
          ],
          "execution": "and"
        }
      }
    }
  },
  "aggs": {
    "available_tags": {
      "terms": {
        "field": "tags"
      }
    },
    "size": 20
  }
}

I have two problems:

1. No matter what value I pass for the aggs/size I get 10 aggregations.
   I want to get more than 10.

2. The hits count that comes back when adding the new tag to the filter doesn't match the doc_count that came with the aggregations, for example, the aggregations might show a doc_count of 12 for the tag "Yellow", but if I add "Yellow" to the filter terms so that it reads "tags": [ "Colorful", "Yellow" ]I get 17 hits instead of the expected 12.

This usually does not happen at the first level, but only in subsequent drill down.

am I doing something wrong? is there a bug somewhere?

this is a cross post from the Elasticsearch mailing list which didn't get enough attention

Answer 1

1. Shard_size cannot be smaller than the size, so you may have a larger size than shard_size. In which case Elasticsearch will override it to be equal to shard_size.

2. Does the filtered results for "Colorful" "and" "Yellow" equal 17 documents instead of the 12 "Yellow" documents?