Comparison - Elasticsearch vs MongoDB

	Elasticsearch	MongoDB
Description	A modern enterprise search engine based on Apache Lucene	One of the most popular document stores
DB-Engines Ranking	Rank - 14, Score - 64.83	Rank - 4, Score - 277.32
Database model	Search engine	Document store
Developer	Apache Software Foundation	MongoDB, Inc
Initial release	2010	2009
License	Open Source	Open Source
Database as a Service	No	No
Implementation language	Java	C++
Server operating systems	All OS with a Java VM	Linux, OS X, Solaris, Windows
Data scheme	schema-free	schema-free
APIs and other access methods	Java API, RESTful HTTP/JSON API	proprietary protocol using JSON
Server-side scripts	No	JavaScript
Triggers	Yes	No
Partitioning methods	Sharding	Sharding
Replication methods	Yes	Master-slave replication
MapReduce	No	Yes
Consistency concepts	Eventual Consistency	Eventual Consistency, Immediate Consistency
Foreign keys	No	No
Transaction concepts	No	No
Durability	Yes	Yes