Elasticsearch 對索引中的兩個字段比較大小進行篩選

如：索引中有兩個 stock 跟 lowStock；現在需要把stock小於等於lowStock的數據篩選出來；可以利用 script來實現

kibana  請求如下：

get  product_search_index/_search
{
  "query":{
    "bool": {"must": [
      {"script": {
        "script":{
          "source": " return doc['stock'].value<=doc['lowStock'].value",
          "lang": "painless"
        }
      }}
    ]}
  }
}

java代碼如下：

BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();

Script script = new Script("doc['stock'].value<=doc['lowStock'].value");

boolQueryBuilder.must(QueryBuilders.scriptQuery(script));
 NativeSearchQueryBuilder searchQueryBuilder = new NativeSearchQueryBuilder(); 
searchQueryBuilder.withFilter(boolQueryBuilder); SearchHits<XXXDTO> search = es.search(searchQueryBuilder.build(), XXXDTO.class);

如果 文檔中某一個字段可能不存在可以改寫如下：

get  product_search_index/_search
{
  "query":{
    "bool": {"must": [
      {"script": {
        "script":{
          "source": " long stock=doc['stock'].value;long lowStock=0; if(doc.containsKey('lowStock')&&doc['lowStock'].size()!=0){ lowStock=doc['lowStock'].value; }   return stock<=lowStock",
          "lang": "painless"
        }
      }}
    ]}
  }
}