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System ElasticSearch CouchDB
 Name ElasticSearch CouchDB
 Version Version 6.4.1 (released in September 2018) 3.3.5
 Drawbacks Elasticsearch AMI not available 1 Does not have capabilities present in an RDF data store e.g does not support SparQL
 Advantages Large number of drivers present for integration NA
 Languages Supported .Net Groovy Java JavaScript Perl PHP Python Ruby .net, C#, Javascript
 Website www.elastic.co/­products/­elasticsearch apache.couchdb.org
 XML Support no NA
 JSON Support yes yes
 Brief description Elasticsearch is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Open Source Transactional database with native graph storage and processing
 Database Model Key Value NoSQL Model Property Graph
 Technical Documentation www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html docs.microsoft.com/­en-us/­azure/­cosmos-db
 License Open Source. Commercial version with HA available with redislabs.com Community license can be run on 1 node.Enterprise License supports multi-node cluster deployment
 Cloud-based / SaaS ElasticSearch Cloud Cluster available from ElasticSearch Amazon AMI available, On Prem can be installed
 Implementation Language C,C++ Java API
 Operating System Supported Linux OS X Solaris Windows Linux , OS X, Windows
 Options for Integration / Access API Proprietary protocol using JSON Rest API
 Consistency Highly Consistent NA
 Foreign Keys No No
 Streaming Support Yes No
 Analytics Support NA No
 Data Storage Schema Inverted Index Key Value Store presented as Document DB
 Notable Users -- --
 Key Differentiator No known Enterprise Competitor apart from Amazaon Cloud Search --
 Concurrency Yes --
 Partitioning Yes --
 Replication Yes --
 Secondary Indexes Yes --
 SchemaLess Yes --
 SQL Query No --