Add total hits relation in result selt

Author: deguif

lib/Elastica/ResultSet.php

@@ -160,6 +160,16 @@ public function getTotalHits()
         return (int) ($data['hits']['total']['value'] ?? 0);
     }
 
+    /**
+     * Returns the total number relation of found hits.
+     */
+    public function getTotalHitsRelation(): string
+    {
+        $data = $this->_response->getData();
+
+        return $data['hits']['total']['relation'] ?? 'eq';
+    }
+
     /**
      * Returns the max score of the results found.
      *