Slowlog differences between 8.17 and 7.17

[prkadalbcisco]

Elasticsearch Version

8.17

Installed Plugins

No response

Java Version

bundled

OS Version

mac

Problem Description

The request shown below works fine on Elasticsearch 7.17 but fails on 8.17

curl -X PUT "http://localhost:9200/my_index3" -H 'Content-Type: application/json' -d'
{
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 1,
    "index.search.slowlog.level": "TRACE"
  }
}
'

On 7.17 -

{"acknowledged":true,"shards_acknowledged":false,"index":"my_index3"}%

On 8.17 -

{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"unknown setting [index.search.slowlog.level]"}],"type":"illegal_argument_exception","reason":"unknown setting [index.search.slowlog.level]"},"status":400}%

Steps to Reproduce

Provided above

Logs (if relevant)

No response

[benwtrent]

This is a known breaking change in v8: #57591

See notes: https://www.elastic.co/guide/en/elasticsearch/reference/current/release-notes-8.0.0.html#breaking-8.0.0

The way to address this is to provide thresholds for the various log levels.