I contacted an expert from SAP. She was able to help me. I had 2 issues. First is the indexing issue. The problem was, I was updating an incorrect solr.xml. I changed /home/username/company/commerce/core-customize/_SOLR_/server/solr/solr.xml instead of /home/username/company/commerce/core-customize/_SOLR_/server/solr/configsets/default/conf/solr.xml. The last issue was regarding Solr admin console not accessible even after confirming that Solr is running in local. The expert shared this link, https://community.sap.com/t5/crm-and-cx-q-a/solr-admin-page-connection-refused-after-upgrading-to-9-5-0-and-sap-cx-to/qaq-p/13855922. It turns out that Solr may not be accessible after upgrade in Windows if the server was started in WSL. I haven't tried the solution in the site yet. Since I've already confirmed Solr admin console is now accessible, I will consider this the accepted answer. Hope it can help someone in the future.