Graph lets you explore relationships in your data. Data in Elasticsearch is generally perceived as a flat list of entities without connections to other entities. This relationship opens up the possibility of new use cases. Graph can surface relationships among entities that share common properties such as people, places, products, or preferences. 

Graph consists of the Graph API and a UI within Kibana, that let you explore this relationship. Under the hood, it leverages distributed querying, indexing at scale, and the relevance capabilities of Elasticsearch.