fix: only generate search tokens for fields with encrypted cast

Added validation to skip token generation for fields that don't have
an encrypted cast. This prevents unnecessary indexing and ensures that
only truly encrypted data gets searchable tokens in the index.

Changes:
- Added hasEncryptedCast() helper method to check field cast type
- Updated updateSearchIndex() to validate encrypted cast before processing
- Improved efficiency by skipping non-encrypted fields early

Author: ginkelsoft-development

src/Traits/HasEncryptedSearchIndex.php

@@ -78,6 +78,11 @@ public function updateSearchIndex(): void
         $rows = [];
 
         foreach ($config as $field => $modes) {
+            // Skip fields that don't have an encrypted cast
+            if (!$this->hasEncryptedCast($field)) {
+                continue;
+            }
+
             $raw = (string) $this->getAttribute($field);
             if ($raw === '') {
                 continue;
@@ -264,6 +269,23 @@ public function scopeEncryptedPrefix(Builder $query, string $field, string $term
         });
     }
 
+    /**
+     * Check if a field has an encrypted cast.
+     *
+     * @param  string  $field
+     * @return bool
+     */
+    protected function hasEncryptedCast(string $field): bool
+    {
+        $casts = $this->getCasts();
+
+        if (!isset($casts[$field])) {
+            return false;
+        }
+
+        return str_contains(strtolower($casts[$field]), 'encrypted');
+    }
+
     /**
      * Resolve the encrypted search configuration for this model.
      *