Bulk edit: 10528 upstream timed out (110: Connection timed out) Error

If there are multiple concurrent bulk edit jobs of the larger data sets (~10k records) and some of them have subset of records that do not need change in value then the Preview on the "Are you sure" form takes a long time to load and fails on timeout, due to [error] 50#50: *10528 upstream timed out (110: Connection timed out)

Steps to Reproduce:

1. Navigate to the "Bulk Edit" => Select "Inventory-Items" app => Select "Items barcodes" from "Record identifier" dropdown
2. Upload a .csv file with 5000 Items barcodes (e.g. with status "Available")
3. Click "Actions" menu => Select "Start Bulk edit" option
4. Select action from the dropdown that will not affect any record (for example, the same status that Items are related yet:  status = "Available")
5. Click "Confirm changes" button

Expected Results:

*"Are you sure?" form opens
*"Preview of the records to be changed" uploaded and  contains all valid Ids from the uploaded file, even if they are not going to be updated
Actual Results:

"Preview of the records to be changed" is NOT uploaded, request fails on timeout

Log

2022/09/15 11:44:07 [error] 50#50: *10528 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 10.23.35.53, server: , request: "POST /mod-data-export-worker/bulk-edit/abfe0d91-7fb0-4599-9d73-c6331b55ad0c/items-content-update/upload HTTP/1.1", upstream: "http://127.0.0.1:8082/bulk-edit/abfe0d91-7fb0-4599-9d73-c6331b55ad0c/items-content-update/upload", host: "pvt.lb.lcp2.folio-eis.us-east-1:8051"

Response time for POST /bulk-edit/${jobId}/items-content-update/upload

For 100 records - about 10-20 seconds
For 1000 records -about 2-3 minutes
For 10k records - unable to get a successful response
For 100k records - unable to get a successful response

Attached log files

Additional information:
From Yauheniya Kryshtafovich: For example, if the user updates item status from to Available to Missing we see following behavior:
1. If the file contains 10K items and some of them (more than 4000 or so) do not need to be updated (already have Status_1= Missing), we may wait a long time for an answer from the endpoint and the preview will time out
2. If the file contains 10K items, and part of them (less than 4000 or so) do not need to be updated (already with Status_1= Missing), the preview will take a long time to be downloaded, but up to 10 minutes, and the preview will be updated