solr/contrib/ltr/src/test-files/featureExamples/fq_features.json

[
    {
        "name": "matchedTitle",
        "class": "org.apache.solr.ltr.feature.SolrFeature",
        "params": {
            "q": "{!terms f=title}${user_query}"
        }
    },
    {
        "name": "popularity",
        "class": "org.apache.solr.ltr.feature.ValueFeature",
        "params": {
            "value": 3
        }
    }
]