G-Mails Google Drive Google Calendar Files All In Google Search Results

Google always Stepped out by bringing periodically new features to be updated the SERPs as when you trying to find some, you should be able to find what you need quickly and easily without needing to think about where your required data placed, whether it's in your email or out on the public web. So for this Google in last August run out a Field Trial to asking for sign up to interact your all Gmail data with personal search results.

And from the Public response Google stated as:

We’ve gotten very positive feedback from those of you testing it out -- such as this note: “The Gmail results feature is awesome! The fact that it's all integrated into one screen is huge.” Many testers have requested being able to find Drive files as well -- as one of you put it, “It would be awesome if I could search my google drive from google search as well :)”. 

Now Google's existing Field Trial simultaneously includes Gmail & Google Drive information in search results is being expanded to work not only from Google.com, but also within Gmail itself. As Google mixing up your personal search results with Gmails & Google drive relevant emails and file in order to making you able for when you  type a search in Gmail you'll instantly see relevant emails as well as results from Google Drive, Google Calendar and more.

Just you need to have a G-mail account in English language to join the existing field Trail to sign up to include  your all data in Google search results as well as in G-mail search box.