Ingest: Foreach processor crashes cluster/node (Stackoverflow)

[fkelbert]

Elastic Cloud 7.5

The following call crashes the node/cluster. This has also been confirmed on an on-prem cluster.

From the logs, this is caused by a Stackoverflow. It seems that the foreach processor is implemented recursively, resulting in the crash.

I want to note that this is not an academic scenario. This happened for real-world data with a large amount of email addresses.

POST _ingest/pipeline/_simulate
{
  "pipeline": {
    "processors": [
      {
        "foreach": {
          "field": "mail.domains",
          "processor": {
            "gsub": {
              "field": "_ingest._value",
              "pattern": "^[^@]*@(.*)$",
              "replacement": "$1"
            }
          }
        }
      }
    ]
  },
  "docs": [
    {
      "_source": {
        "mail": {
          "domains": [
            "foo@bar.com",
            "foo@bar.com",
            "foo@bar.com",
            "foo@bar.com",
            "foo@bar.com",
            "foo@bar.com",
            "foo@bar.com",
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    }
  ]
}

[elasticmachine]

Pinging @elastic/es-core-features (:Core/Features/Ingest)

[danhermann]

@fkelbert, this should be resolved in #50514.

[fkelbert]

Thanks @danhermann. This looks promising.