lookup with matching fields

exports.getkeywordswithSkippingKeywords = async (req, res, next) => {
  try {
    const userId = req.userData.userId;
    const limit = parseInt(req.params.limit);
    const page = parseInt(req.params.page);

    let keywords = await Keyword.aggregate([
      { $match: {} },
      { $sort: { count: -1 } },
      { $skip: limit * page },
      { $limit: limit },
      {
        $lookup: {
          from: Preference.collection.name,
          let: { keywordId: "$_id" },
          pipeline: [
            {
              $match: {
                $expr: {
                  $and: [
                    { $eq: ["$keyword", "$$keywordId"] },
                    {
                      $eq: ["$user", mongoose.Types.ObjectId(userId)],
                    },
                  ],
                },
              },
            },
          ],
          as: "keywordData",
        },
      },
      {
        $project: {
          _id: 0,
          id: "$_id",
          count: 1,
          for: 1,
          against: 1,
          created_at: 1,
          updated_at: 1,
          keyword: 1,
          selected: {
            $cond: {
              if: {
                $eq: [{ $size: "$keywordData" }, 0],
              },
              then: false,
              else: true,
            },
          },
        },
      },
    ]);
    res.status(200).json({ success: true, data: keywords });
  } catch (error) {
    console.log(error);
    res.status(500).json({ success: false, error });
  }
};