Don't know if that file is used by any plugin or theme you are currently using so I suggest you move the file instead of removing it. This way you could recover it in case something wrong happens
sudo mv /opt/bitnami/apps/wordpress/htdocs/wp-content/advanced-cache.php /opt/bitnami/apps/wordpress/htdocs/wp-content/advanced-cache.php.20190722.back
Happy to help!
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