IngestDocument cannot find fields that contain "." in the field name

[desean1625]

Elasticsearch Version

8.15.2

Installed Plugins

No response

Java Version

bundled

OS Version

lunix

Problem Description

IngestDocument doesn't resolve field paths the same way as the rest of the system causing ingest pipelines to fail.

Steps to Reproduce

PUT /users/_doc/1?refresh=wait_for
{
  "email": "mardy.brown@asciidocsmith.com",
  "first_name": "Mardy",
  "last_name": "Brown",
  "city": "New Orleans",
  "county": "Orleans",
  "state": "LA",
  "zip": 70116,
  "web": "mardy.asciidocsmith.com"
}
PUT /_enrich/policy/users-policy
{
  "match": {
    "indices": "users",
    "match_field": "email",
    "enrich_fields": ["first_name", "last_name", "city", "zip", "state"]
  }
}

POST /_enrich/policy/users-policy/_execute

PUT /_ingest/pipeline/user_lookup
{
  "description" : "Enriching user details to messages",
  "processors" : [
    {
      "enrich" : {
        "policy_name": "users-policy",
        "field" : "system1.email",
        "target_field": "user",
        "max_matches": "1"
      }
    }
  ]
}
PUT /my-index-00001/_doc/my_id?pipeline=user_lookup
{
  "system1.email": "mardy.brown@asciidocsmith.com"
}

Logs (if relevant)

No response