Add --flush option to ImportCommand (#937)

* Add `--flush` option to ImportCommand

Adds the `--flush` flag to `artisan scout:import` which if passed in, will flush the index out before importing

* Update ImportCommand.php

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: tobz-nz

src/Console/ImportCommand.php

@@ -17,6 +17,7 @@ class ImportCommand extends Command
      */
     protected $signature = 'scout:import
             {model : Class name of model to bulk import}
+            {--fresh : Flush the index before importing}
             {--c|chunk= : The number of records to import at a time (Defaults to configuration value: `scout.chunk.searchable`)}';
 
     /**
@@ -44,6 +45,10 @@ public function handle(Dispatcher $events)
             $this->line('<comment>Imported ['.$class.'] models up to ID:</comment> '.$key);
         });
 
+        if ($this->option('fresh')) {
+            $model::removeAllFromSearch();
+        }
+
         $model::makeAllSearchable($this->option('chunk'));
 
         $events->forget(ModelsImported::class);