In Elasticsearch, a document holds the information provided by Elasticsearch users. A document is similar to a row in relational databases like MySQL. The documents are stored inside the index created by the users. An index can hold several documents where each document has a unique id.
A document has the data in the form of key-value (key: value) pairs. For example, {"name": "Alen Walker"}. Each document identifies by a unique id and it is associated with a type.
