report stat: fix filter clause in agg

backend/src/appenlight/models/services/report_stat.py

@@ -33,10 +33,12 b' class ReportStatService(BaseService):'
                     "aggs": {
                         "sub_agg": {"value_count": {"field": "tags.group_id.values"}}
                     },
-                    "filter": [
+                    "filter": {
+                        "and": [
                         {"terms": {"resource_id": [resource_id]}},
                         {"exists": {"field": "tags.group_id.values"}},
-                    ],
+                        ]
+                    },
                 }
             },
             "query": {