Elasticsearch 对索引中的两个字段比较大小进行筛选

如：索引中有两个 stock 跟 lowStock；现在需要把stock小于等于lowStock的数据筛选出来；可以利用 script来实现

kibana  请求如下：

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

java代码如下：

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 文档中某一个字段可能不存在可以改写如下：

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"
        }
      }}
    ]}
  }
}