Hello @johnmu have a great day first.
As I noticed Google sitemap is indexed and shown in search result.
But most of site mark noindex to their sitemap.
So, what is the good practices for SEO purpose.
For sitemap
X Robots - follow, noindex
Or
X Robots - follow, index
@shashiranjan On the one hand, if your XML sitemap file ranks for queries that you want your website to rank for, you're doing something very wrong on the rest of the site, and you don't need to fix the sitemap file for it. You'd really need to figure out what's wrong with the rest of your site instead. If it's just indexed, I'd ignore it.
If you absolutely want to noindex it, using the x-robots-tag with noindex is correct.
@johnmu thanks a l lot John. It really very helpful for me.