diff --git a/src/Commands/RebuildDocumentsCommand.php b/src/Commands/RebuildDocumentsCommand.php
index 7c215f2..26bfe4c 100644
--- a/src/Commands/RebuildDocumentsCommand.php
+++ b/src/Commands/RebuildDocumentsCommand.php
@@ -9,10 +9,11 @@ use Illuminate\Contracts\Container\Container;
 use Illuminate\Contracts\Queue\Queue;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Model;
+use MeiliSearch\Client;
 
 class RebuildDocumentsCommand extends Command
 {
-    protected $signature = 'blomstra:search:documents:rebuild';
+    protected $signature = 'blomstra:search:documents:rebuild {--flush : Flush the indices}';
     protected $description = 'Rebuilds the complete search server with its documents.';
 
     public function handle(Container $container)
@@ -23,11 +24,17 @@ class RebuildDocumentsCommand extends Command
         /** @var Queue $queue */
         $queue = $container->make(Queue::class);
 
+        /** @var Client $meili */
+        $meili = $container->make(Client::class);
+
         /** @var Schema $schema */
         foreach ($schemas as $schema) {
             /** @var Model $model */
             $model = $schema::model();
 
+            // Flush the index.
+            if ($this->option('flush')) $meili->index($schema::index())->delete();
+
             $model::query()->chunk(50, function (Collection $collection) use ($model, $queue) {
                 $queue->push(new SavingJob($model, $collection));
 
diff --git a/src/Schemas/DiscussionSchema.php b/src/Schemas/DiscussionSchema.php
index 83e1c01..a48a1c7 100644
--- a/src/Schemas/DiscussionSchema.php
+++ b/src/Schemas/DiscussionSchema.php
@@ -44,11 +44,10 @@ class DiscussionSchema extends Schema
             })->flatten();
         }
 
-        if (! $permissions) {
+        if (! $permissions || $permissions->isEmpty()) {
             $permissions = Permission::query()
                 ->where('permission', 'viewForum')
-                ->pluck('group_id')
-                ->get();
+                ->pluck('group_id');
         }
 
         $filters['groups'] = $permissions->toArray();