[8.19] Remove min_compatible_shard_node from async_submit.search

[pquentin]

I removed this query parameter from async_search and others in #3108, but did not backport it because the change was 9.x only. And indeed, this parameter is supported in _search. However, it's not supported in async_search.submit, which I tested using start-local:

GET /

{
  "name": "f1d952e5550a",
  "cluster_name": "docker-cluster",
  "cluster_uuid": "c9HcK8cGTrqGew8-_CeGDQ",
  "version": {
    "number": "8.18.3",
    "build_flavor": "default",
    "build_type": "docker",
    "build_hash": "28fc77664903e7de48ba5632e5d8bfeb5e3ed39c",
    "build_date": "2025-06-18T22:08:41.171261054Z",
    "build_snapshot": false,
    "lucene_version": "9.12.1",
    "minimum_wire_compatibility_version": "7.17.0",
    "minimum_index_compatibility_version": "7.0.0"
  },
  "tagline": "You Know, for Search"
}

POST /sales*/_async_search?size=0&min_compatible_shard_node=7.17.20
{
  "sort": [
    { "date": { "order": "asc" } }
  ],
  "aggs": {
    "sale_date": {
      "date_histogram": {
        "field": "date",
        "calendar_interval": "1d"
      }
    }
  }
}

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": "request [/sales*/_async_search] contains unrecognized parameter: [min_compatible_shard_node]"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "request [/sales*/_async_search] contains unrecognized parameter: [min_compatible_shard_node]"
  },
  "status": 400
}

While it works in _search.

I don't think this worked at any point in async_search.

[github-actions]

Following you can find the validation changes against the target branch for the APIs.

No changes detected.

You can validate these APIs yourself by using the make validate target.