db.getCollection('users').aggregate([
  { $match: { idapp: '7', username:'Emycapp' } },
  {
    $lookup: {
      from: "naves",
      as: "ingr",
      let: { ind_order: '$ind_order' },
      pipeline: [
        {
          $match: {
            $expr: {
              $and: [
                { $eq: ['$ind_order', '$$ind_order'] },
              ]
            }
          }
        }
      ]
    }
  },
  {
    $replaceRoot: { newRoot: { $mergeObjects: [{ $arrayElemAt: ["$ingr", 0] }, "$$ROOT"] } }
  },
  {
    $match: { made_gift: { $exists: true } }
  }

])