Description:
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Your site's search bar doesn't contain the "maxlength" html attribute, I enter an absurd amount of characters, if your server doesn't filter these characters, they can cause a Denial Of Service attack 

Test script:
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#this script works on any page on the site that contains the search bar.
# please in console navigator paste lines one for one 
# tested in https://www.php.net/



document.getElementsByName("pattern")[0].value = "A".repeat(10000000)

document.getElementsByName("pattern")[0].value;

Expected result:
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Demonstrate how it can set a huge value in the search bar, if the attacker enters and your server doesn't filter these characters, they can cause a DOS attack