ayumiono commented on issue #7369:
URL: https://github.com/apache/skywalking/issues/7369#issuecomment-886407344


   > > What the bug exactlly is the ES return multiple docs when we search 
instance_traffiic by id, and we chose a wrong indice to update
   > 
   > Where does a duplicate record come from? We don't insert the entity into 
the newer index at all.
   
   thanks for you reply. the ES return duplicate record because of 
we(skywalking es persistence plugin) search ES by indice alias
   
   ```
   @Override
       public List<Metrics> multiGet(Model model, List<String> ids) throws 
IOException {
           SearchResponse response = getClient().ids(model.getName(), 
ids.toArray(new String[0]));
   
           List<Metrics> result = new 
ArrayList<>(response.getHits().getHits().length);
           for (int i = 0; i < response.getHits().getHits().length; i++) {
               Metrics source = 
storageBuilder.map2Data(response.getHits().getAt(i).getSourceAsMap());
               result.add(source);
           }
           return result;
       }
   ```


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