add changes tracking back

services/track-changes/app/js/HttpController.js

@@ -20,7 +20,7 @@ const logger = require('@overleaf/logger')
 const HealthChecker = require('./HealthChecker')
 const _ = require('underscore')
 const Path = require('path')
-const { pipeline } = require('stream')
+// const { pipeline } = require('stream')
 
 module.exports = HttpController = {
   flushDoc(req, res, next) {

services/track-changes/app/js/MongoAWS.js

@@ -16,10 +16,10 @@ const logger = require('@overleaf/logger')
 // const AWS = require('aws-sdk')
 // const S3S = require('s3-streams')
 const { db, ObjectId } = require('./mongodb')
-const JSONStream = require('JSONStream')
-const ReadlineStream = require('byline')
-const zlib = require('zlib')
-const Metrics = require('@overleaf/metrics')
+// const JSONStream = require('JSONStream')
+// const ReadlineStream = require('byline')
+// const zlib = require('zlib')
+// const Metrics = require('@overleaf/metrics')
 
 const DAYS = 24 * 3600 * 1000 // one day in milliseconds