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System AWS Redshift ElasticSearch
 Name -- ElasticSearch
 Version -- Version 6.4.1 (released in September 2018)
 Drawbacks -- Elasticsearch AMI not available
 Advantages -- Large number of drivers present for integration
 Languages Supported -- .Net Groovy Java JavaScript Perl PHP Python Ruby
 Website -- www.elastic.co/­products/­elasticsearch
 XML Support -- no
 JSON Support -- 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.
 Database Model -- Key Value NoSQL Model
 Technical Documentation -- www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html
 License -- Open Source. Commercial version with HA available with redislabs.com
 Cloud-based / SaaS -- ElasticSearch Cloud Cluster available from ElasticSearch
 Implementation Language -- C,C++
 Operating System Supported -- Linux OS X Solaris Windows
 Options for Integration / Access API -- Proprietary protocol using JSON
 Consistency -- Highly Consistent
 Foreign Keys -- No
 Streaming Support -- Yes
 Analytics Support -- NA
 Data Storage Schema -- Inverted Index
 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