Resolve "Relevance Ranking in Metadata"

Required MRs to be merged before

• codeabilitysharingpluginapi!2 (merged)
• !217 (merged)
• codeabilitysharingpluginapi!3 (merged)

Related to #439 (closed)

src/main/java/at/ac/uibk/gitsearch/repository/search/MetaDataRepository.java

@@ -594,6 +594,29 @@ public class MetaDataRepository {
     }
 
     private List<SortOptions> getDefaultSortStrategy() {
+        /** todo try this
+         * GET /my_index/_search
+         * {
+         *  "query": {
+         *    "match_all": {}
+         *  },
+         *  "sort": {
+         *    "_script": {
+         *      "type": "number",
+         *      "script": {
+         *        "lang": "painless",
+         *        "source": "doc['fieldA'].value * params.factorA + doc['fieldB'].value * params.factorB",
+         *        "params": {
+         *          "factorA": 1.0,
+         *          "factorB": 100.0
+         *        }
+         *      },
+         *      "order": "desc"
+         *    }
+         *  }
+         * }
+         */
+
         return List.of(
             getSortOptionForFieldAndOrder(SearchRepositoryConstants.SEARCHSTATISTICS_BADGEREWARDED, SortOrder.Desc, FieldType.Boolean),
             getSortOptionForFieldAndOrder(SearchRepositoryConstants.SEARCHSTATISTICS_DOWNLOADS, SortOrder.Desc, FieldType.Integer),