Database
[{"performance_data":{"campaign.accessible_bidding_strategy":"customers/41594039855/accessibleBiddingStrategies/8763515023","campaign.ad_serving_optimization_status":"OPTIMIZE"}},{"performance_data":{"campaign.accessible_bidding_strategy":"customers/41594039855/accessibleBiddingStrategies/8763515023","campaign.ad_serving_optimization_status":"ACTIVE"}}]
Query
db.collection.find({"$expr":{"$eq":[{"$getField":{"field":"campaign.ad_serving_optimization_status","input":"$performance_data"}},"ACTIVE"]}})