Q:

Search not showing any results.  Not even for '*'

We know this a very common question which as resolutions already given like below.  However these are not working for us;
WebSite search does not find any result
Search Results Web Part is not showing any results
Search box not returning any results
amongst others...
We are banging our heads for hours now.  
Content gets crawled correctly.  No errors
However Search just doesn't show any result.  Not even for "*"
We have Followed the below MSDN link to configure Search Service Application
Create and configure search service application
Then set Service connections in Central Admin for the Web Application

Then confirmed the Crawl URL is same as the URL of Application in Alternate Access Mapping for Default Zone
[Update]
Topology status;

Crawl Status

Kindly let know are we missing any thing.  Kindly let know if any further details required. 

A:

My Bad,
All by mistake while i was creating the Site Collection had given a different user as Site Collection Administrator than the user used for Content source account.  After setting the Site Col admin account same as the content source account.  results started showing as expected.