Field Collapsing（欄位摺疊）不能與scroll、rescore以及search after 結合使用

• collapse欄位：表示按照age（每個age對應多條document結果）的值摺疊（keyword或者數值）
• sort：表示按照age欄位排序

• from：偏移，即前180個document的值都被摺疊掉了

  curl -XGET "http://localhost:9200/bank/_search" -H 'Content-Type: application/json' -d'
  {
      "query": {
  "match": {
      "address": "Place"
  }
   },
      "collapse" : {
          "field" : "age" 
   },
      "sort": ["age"], 
      "from": 10
          }''
   
  

• Expand collapse results（對於每個摺疊的結果，可以通過inner_hits展開結果）

  • max_concurrent_group_searches：允許每組檢索inner_hits的併發請求數 (預設按照執行緒池的大小或者資料節點數）

  • 單個inner_hits

    curl -XGET "http://localhost:9200/bank/_search" -H 'Content-Type: application/json' -d'
    {
    "query": {
        "match": {
            "address": "Place"
        }
    },
    "collapse" : {
        "field" : "age", 
        "inner_hits": {
            "name": "test", 
            "size": 5, 
            "sort": [{ "age": "asc" }] 
        },
        "max_concurrent_group_searches": 4 
    },
    "sort": ["age"]
    }'
     
    

  • 多個inner_hits

    curl -XGET "http://localhost:9200/bank/_search" -H 'Content-Type: application/json' -d'
    {
        "query": {
            "match": {
                "address": "Place"
            }
        },
        "collapse" : {
            "field" : "age", 
            "inner_hits":[ {
                "name": "age", 
                "size": 2, 
                "sort": [{ "age": "asc" }] 
            },
            {
            "name":"account_number",
            "size": 2, 
            "sort": [{ "account_number": "asc" }] 
            }],
            "max_concurrent_group_searches": 4
        },
        "sort": ["age"]
    }'