Redis vs Elasticsearch

Comparison Index	Redis	Elasticsearch
Introduction	Redis is in-memory data structure store, used as database, cache and message broker	Elasticsearch is a modern search and analytics engine based on Apache Lucene
Primary database model	Key-value store	Search Engine
DB-Engines Ranking	Score120.41 Overall Rank #9 Rank in Key-value stores #7	Score120.00 Overall Rank #10 Rank in Search engines #1
Website	redis.io	www.elastic.co/¬products/¬elasticsearch
Technical documentation	redis.io/¬documentation	www.elastic.co/¬guide/¬index.html
Developed By	Salvatore Sanfilippo	Elastic
Initial release	2009	2010
Current release	4.0.2, September 2017	5.6.1, September 2017
License info	Open Source info	Open Source info
Cloud-based info	no	no
Implementation language	C	Java
Server operating systems	BSD Linux OS X Windows	All OS with a Java VM
Data scheme	schema-free	schema-free
Typing	partial	yes
XML support		no
Secondary indexes	no	yes
SQL	no	no
APIs and other access methods	proprietary protocol	Java API RESTful HTTP/JSON API
Supported programming languages	C C# C++ Clojure Crystal D Dart Elixir Erlang Fancy Go Haskell Haxe Java JavaScript (Node.js) Lisp Lua MatLab Objective-C OCaml Perl PHP Prolog Pure Data Python R Rebol Ruby Rust Scala Scheme Smalltalk Tcl	.Net Clojure Erlang Go Groovy Haskell Java JavaScript Lua Perl PHP Python Ruby Scala
Server-side scripts	Lua	yes
Triggers	no	yes
Partitioning methods	Sharding	Sharding
Replication methods	Master-slave replication	yes
MapReduce	no	no
Consistency concepts	Eventual Consistency	Eventual Consistency
Foreign keys	no	no