Add min_score support

[romainruaud]

https://www.elastic.co/guide/en/elasticsearch/reference/7.17/search-search.html#search-api-min-score

This would allow to prevent having too much results. This can be useful for some customers.

[romainruaud]

1. Add a configuration for "min_score" in the Elasticsuite relevance config :

• create a new group via XML (https://github.com/Smile-SA/elasticsuite/blob/2.11.x/src/module-elasticsuite-core/etc/adminhtml/elasticsuite_relevance.xml#L62)
• this group must contain two fields :
  • "Use Min Score" (yes/no) : default to "no".
  • Min score : text input, validated as integer, cannot be empty. Default to 0.

This should be displayed in the Menu "Elasticsuite > Relevance Configuration"

2. Implement the logic to get this field as part of the Relevance Config.

You can check this commit, it's nearly the same, when I introduced the "span boost" : 58f22d9

In this interface you'll have to add a way to get the min_score, something like getMinScore() :

module-elasticsuite-core/Api/Search/Request/Container/RelevanceConfigurationInterface.php

Then implement it :

module-elasticsuite-core/Search/Request/ContainerConfiguration/RelevanceConfig.php

You'll have a getMinScore() method that will return either false or an integer.

Then implement the config factory :

module-elasticsuite-core/Search/Request/ContainerConfiguration/RelevanceConfig/Factory.php

If enabled, this returns the value. False otherwise.

3. Inject it on query time

You'll need to add a getMinScore() method to this interface : https://github.com/Smile-SA/elasticsuite/blob/2.11.x/src/module-elasticsuite-core/Search/RequestInterface.php

And then, add the minScore as a property here, with also the appropriate getMinScore : https://github.com/Smile-SA/elasticsuite/blob/2.11.x/src/module-elasticsuite-core/Search/Request.php

You'll have then to plug nearly here to inject the minScore: https://github.com/Smile-SA/elasticsuite/blob/2.11.x/src/module-elasticsuite-core/Search/Request/Builder.php#L181

Probably something in the array like 'minScore' => $containerConfig->getRelevanceConfig()->getMinScore()

And then finally on the mapper, something similar to this :

https://github.com/Smile-SA/elasticsuite/blob/2.11.x/src/module-elasticsuite-core/Search/Adapter/Elasticsuite/Request/Mapper.php#L76

        if ((int) $request->getMinScore() > 0) {
            $searchRequest['min_score'] = $request->getMinScore();
        }

Then to check, you'll have to enable/disable the min_score feature, change the value, and check that in the resulting Elasticsearch query, when you do a text search, you have a min_score with the proper value when it's enabled. When it's disabled or set to 0, you should have nothing.

[romainruaud]

Done in latests releases