I am working on a site and it has a sub domain which has almost 25K pages indexed in Google. This subdomain is of no use anymore and its main site (root domain) has the same content. My question is how to effectively handle this.
- Redirect all the pages to the root domain.
- Take down these pages and send URL removal request in search console.
- no-index them only.
PS - this subdomain has Page authority of 49/100 and total links are - 39 only and most of these links are coming from the site owners other sites.