MongoDB, nodejs: killed. Утечка памяти

const mongoose = require("mongoose");
const moment = require("moment");
const axios = require("axios");
const alog = require("axios-logger");
const { Orders } = require("./db");
const { Types } = mongoose;

const instance = axios.create({
  baseURL: "URL",
  timeout: 45000,
});
instance.interceptors.request.use((config) => {
  config.params = config.params || {};
  config.params["userlogin"] = "LOGIN";
  config.params["userpsw"] = "PASS";
  return alog.requestLogger(config);
});

(async () => {
  await mongoose.connect("mongodb://127.0.0.1/abcp", {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
    useFindAndModify: true,
  });
  var period = 2;
  var start = moment().subtract(1, "y"),
    next = start;

  for (; !next.isAfter(moment()); ) {
    next = start.clone().add(period, "weeks");
    var r = await instance.get("cp/orders", {
      params: {
        dateCreatedStart: start.format("YYYY-MM-DD 00:00:00"),
        dateCreatedEnd: next.format("YYYY-MM-DD 00:00:00"),
      },
    });
    console.log(`Status: ${r.status}`);

    var data = [];
    var counter = 0;
    r.data.map(async (i) => {
      data.push({
         updateOne: {
            filter: {number: i.number},
            update: i,
            upsert: true
         }
      })
      counter++;
      if (counter % 1000 == 0) { 
         try {
            await Orders.bulkWrite(data, {ordered: false, j: false, wtimeout: 30000});
            console.log("added");
            data = [];
         } catch(e) {
            console.log(e);
         }
      }
    }); 
    start = next;
  }
})();