lexical error: malformed number, a digit is required after the minus sign?

Question

I am getting the following response when trying to POST an object to an index:

{
  "message": "lexical error: malformed number, a digit is required after the minus sign. Around '------WebK' near line:1 column:1", "status": 400
}

What can I do to fix this?

Answer 1

You need to POST your data as JSON to the API endpoint, not as a form-data form submission.