You can submit your website Sitemaps to 3 major search engines: Google, Bing and Yandex
Instructions for each can be found below:
a) Google Search Console (Formerly Google Webmaster Tools)
1) Sign in to Google Search Console.
2) On your Search Console home page, select your website.
3) In the left sidebar, click Crawl and then Sitemaps.
4) Remove outdated or invalid sitemaps like sitemap.xml
5) Click the Add/Test Sitemap button in the top right.
6) Enter sitemap_index.xml into the text box that appears.
7) Click Submit.
b) Bing Webmaster Tools
1) Sign in to Bing Webmaster Tools.
2) On the My Sites page, select your website.
3) In the left sidebar, click Configure My Site and then Sitemaps.
4) Remove outdated or invalid sitemaps like http://example.com/sitemap.xml
5) Enter your sitemap URL into the text box at the top. Your sitemap URL will look like something like this: http://example.com/sitemap_index.xml.
6) Click Submit.
c) Yandex Webmaster
1) Sign in to Yandex Webmaster.
2) On the home page, select your website.
3) In the left sidebar, click Indexing Options and then Sitemap files.
4) Remove outdated or invalid sitemaps like http://example.com/sitemap.xml
5) Enter your sitemap URL into the text box at the top. Your sitemap URL will look like something like this: http://example.com/sitemap_index.xml.
6) Click Add.
