Add highlight implementation for redisearch adapter

Author: alexander-schranz

packages/seal-redisearch-adapter/src/RediSearchSchemaManager.php

@@ -173,7 +173,7 @@ private function createJsonFields(array $fields, string $prefix = '', string $js
                     'sortable' => $field->sortable,
                     'filterable' => $field->filterable,
                 ],
-                $field instanceof Field\ObjectField => $indexFields = \array_replace($indexFields, $this->createJsonFields($field->fields, $name, $jsonPath)),
+                $field instanceof Field\ObjectField => $indexFields = \array_replace($indexFields, $this->createJsonFields($field->fields, $name . '.', $jsonPath)),
                 $field instanceof Field\TypedField => \array_map(function ($fields, $type) use ($name, &$indexFields, $jsonPath, $field) {
                     $newJsonPath = $jsonPath . '[\'' . $type . '\']';
                     if ($field->multiple) {

packages/seal-redisearch-adapter/src/RediSearchSearcher.php

@@ -96,6 +96,20 @@ public function search(Search $search): Result
             }
         }
 
+        if ($search->highlightFields !== []) {
+            $arguments[] = 'HIGHLIGHT';
+            $arguments[] = 'FIELDS';
+            $arguments[] = \count($search->highlightFields);
+
+            foreach ($search->highlightFields as $highlightField) {
+                $arguments[] = $highlightField;
+            }
+
+            $arguments[] = 'TAGS';
+            $arguments[] = $search->highlightPreTag;
+            $arguments[] = $search->highlightPostTag;
+        }
+
         $arguments[] = 'DIALECT';
         $arguments[] = '3';