From field used for pagination isn't showing

Versions : OpenSearch 2.9

In discovery tab when I query index for last day it show over 70k events (see attached)

When I run the following dsl query(please note index pattern in Disovery matched the index name I am running query against):

GET kubernetes-st1-*/_search?pretty=true
{"query":{"bool":{"must":[{"match": { "kubernetes.namespace_name": "performance-reporting-api-prod"}}],"filter": [{"range": {"@timestamp":{"gte":"now-24h","lte":"now"}}}]}}}

I am only getting first 10k data, which is fine as long as I can do my pagination on. Per Paginate results - OpenSearch Documentation I am supposed to get from field in my json return. Which I don’t get. Another thing they recommend is to get scroll_id. In this case I know I need 7 pages to query, but why isn’t from field showing?

{
  "took": 16,
  "timed_out": false,
  "_shards": {
    "total": 70,
    "successful": 70,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 10000,
      "relation": "gte"
    },
    "max_score": 11.644901,
    "hits": [
      {
        "_index": "kubernetes-st1-2024.10.20",
        "_id": "6FBRrJIB2usrQrsSNZTM",
        "_score": 11.644901,
        "_source": {

Configuration:

Relevant Logs or Screenshots:

@stecino As far as I can see in the documentation from is used in the query.