CODE EXAMPLE FOR HTML

Magento Reindex Error : Catalog Search index process unknown error: "-//IETF//DTD HTML 2.0//EN" 405 Method Not Allowed

    /etc/apache2/sites-available/elasticsearch.conf

    => paste this code

    <VirtualHost *:8080>
    ProxyPass "/" "http://localhost:9200/"
    ProxyPassReverse "/" "http://localhost:9200/"
    </VirtualHost>

    sudo a2ensite elasticsearch.conf

Visit this link for detailed clarification


https://www.magetop.com/blog/install-magento-2-4-2-on-ubuntu/#5_Install_Elasticsearch