Mongo Update $or

mongo.js

db.orders.update(
    {
        $or: [
            {"line_items.sku":"TEA-BLCK"},
            {"line_items.sku":"TEA-GREEN"},
            {"line_items.sku":"TEA-CHAI"}
          ]
    },
    {   
        $set: {
            "something":{}
        }
    },
    {
        "multi":true
    }
);