Indexing is one of the important part to show your search results in the web searches but some times google do not even index that specific post which led your efforts to go in vein.
Recently we were facing issues with google indexing and no one know what was the issue with indexing untill Google came up with the tweet.
There was some issue with indexing issue and google was working to find out the glitch. They were working on the root cause finding what actually led to this problem.
Again they have updated about the issue. They have found the root cause and working for the same to resolve.