[{"_id":ObjectId("5ce6bfea63519d2f77014dcc"),"lead_name":[{"Bill":"Toz"},{"Gordon":"Banks"}],"lead_email":[{"email":"bto@.com"}],"lead_phone_number":[{"phone_number":"+148034543"}],"lead_country":[{"country":"US"}],"lead_city":[{"city":"Phoenix"}],"lead_team_id":"5cd98dd163519d6dd94aff12","lead_source_id":"5cd98c9d63519d61432db1c5","lead_status_id":"5cd98c9e63519d61432db387","lead_assigned_to_user_id":"","created_on_timestamp":1558625945,"last_updated_on_timestamp":1558625945,"lead_last_interaction_timestamp":1558625945,"lead_last_interaction_subject":"Inbound call - answered","lead_products":[],"lead_metadata":[]}]

db.collection.aggregate([{$match:{"lead_name":{$elemMatch:{"Bill":{$ne:null}}}}}])