I just change my website all url's and now my old url is showing on google index. When i am searching any keyword then my previous links are showing there. suppose my old url is https://example.com/elans-town-commercial-project-for-sale and now new url is https://example.com/elans-town-for-sale.
Please let mw know how i can permanent redirect my all urls to new urls. Because i don't want to remove my old URL's by google webmaster tools.
You can't force it to re-index. You have to wait until Google re-indexes that page again. The best thing you can do is placing a redirect to the new URL with HTTP status "Moved Permanently".
Also, this is the reason why permalinks exist, by the way...
return redirect()->route('routeName', $params, \Illuminate\Http\Response::HTTP_MOVED_PERMANENTLY);
Updated answer
You can add a list of redirects to your web.php
You can handle redirects via a database using kmlpandey77/laravel-redirection
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