[BUG] QAT specific settings should only applicable for QAT codecs only.

[sarthakaggarwal97]

What is the bug?

In the current implementation, the index.codec.qatmode is introduced but it does not validate if the setting can be applied to all codecs or not. Ideally, this setting should be applied only for QAT codecs.

How can one reproduce the bug?

Request:

curl --location --request PUT 'http://localhost:9200/index-10045' \
--header 'Content-Type: application/json' \
--data-raw '{
  "settings": {
    "index": {
      "codec": "zstd",
      "codec.qatmode": "auto"
    }
  }
}'

Response:

{
    "acknowledged": true,
    "shards_acknowledged": true,
    "index": "index-10045"
}

What is the expected behavior?

QAT specific settings should only be applied for QAT codecs

[dblock]

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