code: def sanitize_http_request_querystring(client, event):
      
      try:
          query_string = force_text(event["context"]["request"]["url"]["search"], errors="replace")
      except (KeyError, TypeError):
          return event
      if "=" in query_string:
          sanitized_query_string = _sanitize_string(query_string, "&", "=")
          full_url = event["context"]["request"]["url"]["full"]
          event["context"]["request"]["url"]["search"] = sanitized_query_string
          event["context"]["request"]["url"]["full"] = full_url.replace(query_string, sanitized_query_string)
      return event
docs: Sanitizes http request query string
  
      :param client: an ElasticAPM client
      :param event: a transaction or error event
      :return: The modified event