Cognitive Search, a new preview feature in the existing Azure Search service, includes an enrichment pipeline allowing you to find rich structured information from documents. That information can then become part of your Azure Search index. Cognitive Search also integrates with Natural Language Processing capabilities and includes built-in enrichers called cognitive skills. Built-in skills help to perform a variety of enrichment tasks, such as the extraction of entities from text or image analysis and OCR capabilities. Cognitive Search is also extensible and can connect to your own custom-built skills.
Source: Azure Roadmap