How do you find documents with a matching item in an embedded array?

 db.vehicle.dropIndex(“description_text”)  db.vehicle.dropIndex({“description”:”text”})  db.vehicle.removeIndex({“description”:”text”})  db.vehicle.removeIndex(“description_text”)[...]

 getDateTime(_id)  _id.createDate()  _id.getTimestamp()  _id.getDateTime()[...]

 every 2 minutes  every 5 seconds  every 2 seconds  every 10 seconds[...]