HOW TO INDEX A BLOGPOST IMMEDIATELY IN SEARCH ENGINES

METHOD NO 1
You need to have your site registered in Google Webmasters Tools. 
Then Goto Your

• Dashboard>
• Diagnostics>
• Fetch as googlebot>
• Here enter url of your post. And click on Fetch. This will fetch your URl.
• Then Click on Index after successful fetch. Ans select Fetch Single URL option.

THE DRAWBACK OF ABOVE URL IS THAT YOU CAN SUBMIT MAX 50 POSTS.

OR IF YOU DONT WANT TO DO THIS THEN THUS GO TO PINGLER.COM OR PINGOAT.NET AND SUBMIT THERE.IT WILL GET INDEXED WITHIN 12 HOURS