If you are a SharePoint 2010 Developer and trying to figure out how search works in Sharepoint Online, this is for you. As i am one of you and like i said in my first post on my blog, the content is not to show what i know, but to share what i have learned.
We will refer to 2010 concepts like "Managed Properties", "Content Sources", "Search Scopes", "Search Result webparts" and see how we going to achieve the same results in Sharepoint online.
Before you jump into solutions / development, you should know how things were changed from SP2010 to SP Online. You (Admin) used to manage everything in Sharepoint On-Premises from Central Admin, but not in SP Online. Below image will depict what will be your responsibility as a Global administrator of your tenant.
Looking at the Admin portal of your tenant, you may figure out that you cannot do everything you can do in SP2010 Central Admin.