failed to parse [function_score] query. array [random_score] is not supported

[faizangulzar]

{
  "query": {
    "function_score": {
      "query": {
        "bool": {
          "should": [
            {
              "match": {
                "categorygroup": {
                  "query": "13",
                  "operator": "or"
                }
              }
            }
          ]
        }
      },
      "random_score": {}
    }
  }
}

When I search via "Postman", it returns random results every time because of using the "random_score" field in the search query. When I search using "cviebrock/laravel-elasticsearch" package in my laravel app, it returns an error :

failed to parse [function_score] query. array [random_score] is not supported

Without the 'random_score' field, it works fine. But I wanted to get Randomly sorted results every time.

I am using :

"php": "^7.3|^8.0",
"cviebrock/laravel-elasticsearch": "^8.0",
Elasticsearch: 7.15.1

Could anyone help me with this? I will be thankful!

[cviebrock]

This certainly isn't an issue with the package, since any queries you create just get passed through to the underlying ES client.

If I had to guess, then either random_score should be an empty array [] and not an empty object {} ... or the ES client is converting the empty object to an empty array by mistake. Depending on how you build your query, you might be able to coerce the conversion properly?

[faizangulzar]

Above is the query array before passing in package 'search' method Elasticsearch::search($query);

[faizangulzar]

 "random_score": {
    "seed": "1477072619038"
 }

I used "seed" field under "random_score", now its giving random results.

Thankyou for you response, @cviebrock

[cviebrock]

It might be worth testing your query (without the explicit seed) using the native ES PHP client directly. If it doesn't work there (and I suspect it won't), then raise this as an issue with them: https://github.com/elastic/elasticsearch-php/issues

Not sure if this issue is any help, but it suggests using

'random_score' => new \StdClass()

instead of an empty array. Again, I suspect the official PHP client is serializing things unexpectedly.