[{"_id":ObjectId("505fd43fdbed3dd93f0ae088"),"categoryName":"Cat 1","media":{"logo":"images (1).jpg","pictures":[{"file_name":"Plr9_GA26JcA.png","status":false},{"file_name":"images (1).jpg","status":false},]}},{"_id":ObjectId("505fd43fdbed3dd93f0ae089"),"categoryName":"Cat 2","media":{"logo":"images (1).jpg","pictures":[{"file_name":"Plr9_GA26JcA.png","status":false},{"file_name":"images (1).jpg","status":false},]}}]

db.collection.update({_id:ObjectId("505fd43fdbed3dd93f0ae088")},{$set:{"media.pictures.$[].status":true}})