why my site http://blog.sunstore.in is not getting indexed?

[Richard]

If it is a subdomain, then it is treated by Google as entirely on a different topic within the niche... so this is close to having a separate website.. unlike if you place it as a subdirectory sunstore.in/blog. What you can do is claim the webmaster tool account for this subdomain and build more links to it from highly relevant sites with good traffic. Remember to keep it natural and do not spam. Also check your setting if your website is somehow blocking crawlers. I see that you are using wordpress with the yoast plugin... make sure that all robot commands are set to index. Also check you robots.txt. Finally, make sure your http://blog.sunstore.in/sitemap.xml will reflect all content you want to be indexed and exclude what you don't want.