Elasticsearch: Fix processing of response with multiple group by for alerting #65165
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This PR fixes processing of response with multiple group by on backend. On backend, we were missing using fields from frames if there already were any, and add fields from
propKeys
if there weren't any. This is correctly done on frontend implementation where we check if we have anycolumns
and if yes, we use them instead of addingpropKeys
.Fixes: #64727
Part of #54011
How to test:
elasticsearchBackendMigration=true
runmake devenv sources=elastic
![image](https://user-images.githubusercontent.com/30407135/226873270-fe7cc1e3-e9f5-497e-aac4-9b482001385d.png)
4. There should be a correct response in table