code: def sanitize_http_request_body(client, event):
      
      try:
          body = force_text(event["context"]["request"]["body"], errors="replace")
      except (KeyError, TypeError):
          return event
      if "=" in body:
          sanitized_query_string = _sanitize_string(body, "&", "=")
          event["context"]["request"]["body"] = sanitized_query_string
      return event
docs: Sanitizes http request body. This only works if the request body
      is a query-encoded string. Other types (e.g. JSON) are not handled by
      this sanitizer.
  
      :param client: an ElasticAPM client
      :param event: a transaction or error event
      :return: The modified event