curl --location --request POST 'https://api.getmetal.io/v1/index' \
--header 'Content-Type: application/json' \
--header 'x-metal-api-key: <api-key>' \
--header 'x-metal-client-id: <client-id>' \
--data-raw '{
    "index": "index-id",
    "text": "text that will be embedded",
    "id": "my-unique-id",
    "metadata": {
      "fieldA": "my custom value",
      "fieldB": "my other custom value"
    }
}'

{

  "data": {
    "id": "my-unique-id",
    "text": "text that will be embedded",
    "createdAt": "2023-03-17T17:21:13.163Z",
    "metadata": {
      "fieldA": "my custom value",
      "fieldB": "my other custom value"

      }
  }

}