Elasticsearch自定義聚合結果

Question

在我開發的培訓模塊中，有一個頁面將所有課程列入帶可篩選標題的表格視圖。其中一列是「已保存」列，如果我加了書籤，它將被「保存」，如果沒有，則會被保存爲「未保存」。

課程實體索引如下：

{ 
    "_index": "myindex", 
    "_type": "course", 
    "_id": "248fc0a2-06e1-11e6-b740-000c298fdb4d", 
    "_score": 1, 
    "_source": { 
    "boost_number": 1, 
    "entity_type_number": 64, 
    "course_status_string": "Closed", 
    "title": "My Test Course", 
    "body": "This is just a test course", 
    "created_date": "20160420T101753Z", 
    "categories_uuid": [ ], 
    "segment_string": [ 
    "Other" 
    ], 
    "vertical_string": [ 
    "Other" 
    ], 
    "saved_users_uuid": [ 
    "251bde26-4adf-11e4-b705-000c298fdb4d", 
    "00026884-7cc8-11e3-a570-fa163e2bcb7a", 
    "00061164-9283-11e5-a394-000c298fdb4d", 
    "00110a72-0b8b-11e4-9a64-fa163e2bcb7a", 
    ] 
} 

比方說，我曾與ID登錄： 「251bde26-4adf-11e4-b705-000c298fdb4d」。 當查詢彈​​性方面，我收到此鬥：

"saved_users" : { 
    "doc_count_error_upper_bound": 0, 
    "sum_other_doc_count": 0, 
    "buckets" : [ 
     { 
      "key" : "251bde26-4adf-11e4-b705-000c298fdb4d", 
      "doc_count" : 5 
     }, 
     { 
      "key" : "00026884-7cc8-11e3-a570-fa163e2bcb7a", 
      "doc_count" : 0 
     }, 
     ... 
    ] 
} 

不過，我想有其他自定義鬥如：

{ 
    ... 
    "buckets": [ 
    { 
     "key": "Saved", 
     "doc_count": ... 
    }, 
    { 
     "key": "Unsaved", 
     "doc_count": ... 
    }, 
    ] 
} 

這可能嗎？我怎麼能這樣做？

Answer 1

你可以嘗試添加以下filters aggregation：

{ 
    "size": 0, 
    "aggs": { 
    "category": { 
     "filters": { 
     "filters": { 
      "Saved": { 
      "exists": { 
       "field": "saved_users_uuid" 
      } 
      }, 
      "Unsaved": { 
      "missing": { 
       "field": "saved_users_uuid" 
      } 
      } 
     } 
     } 
    } 
    } 
}