Add basic aggregation support to OpenSearch

src/Driver/OpenSearch/OpenSearch.php

@@ -233,6 +233,10 @@ public function search(Search $search): SearchResult
             }
         }
 
+        if (isset($response->aggregations) && is_object($response->aggregations)) {
+            $result->setAggregations($response->aggregations);
+        }
+
         foreach ($response->hits->hits as $resultDocument) {
             /** @var ModelInterface $model */
             $model = new $modelClassName();

src/Search/SearchResult.php

@@ -16,6 +16,7 @@ class SearchResult extends ModelCollection
     protected ?int $searchTime = null;
     protected ?int $totalCount = null;
     protected ?CountRelation $totalCountRelation = null;
+    protected ?object $aggregations = null;
 
     /**
      * @return int|null
@@ -70,4 +71,25 @@ public function setTotalCountRelation(?CountRelation $totalCountRelation): stati
         $this->totalCountRelation = $totalCountRelation;
         return $this;
     }
+
+    /**
+     * Aggregations returned by OpenSearch, if any.
+     * The structure of this object depends on the aggregations defined in the search query.
+     *
+     * @return object|null
+     */
+    public function getAggregations(): ?object
+    {
+        return $this->aggregations;
+    }
+
+    /**
+     * @param object|null $aggregations
+     * @return $this
+     */
+    public function setAggregations(?object $aggregations): static
+    {
+        $this->aggregations = $aggregations;
+        return $this;
+    }
 }