Implementing noindex. There are two ways to implement noindex : as a <meta> tag and as an HTTP response header. They have the same effect; choose the method that is more convenient for your site and appropriate for the content type. Specifying the noindex rule in the robots.txt file is not supported by Google.

For sites that you've verified ownership for in your Webmaster Tools account, you'll now see a new option under the Diagnostic tab called URL Removals. To get started, simply click the URL Removals link, then New Removal Request. Choose the option that matches the type of removal you'd like.

Automatic indexing via the Google Indexing API Websites that have many short-lived pages, such as job postings, event announcements, or livestream videos, can use Google's Indexing API to automatically request them to crawl and index new content and content changes.

Indexing is when Google finds (crawls) your page, then processes content of the page and puts the page into the Google index (indexes it), where the page may be eligible to appear in Google Search results, as well on as other Google services, like Discover. For more about indexing, read how Google Search works.