Elasticsearch

Elasticsearch is a distributed RESTful search engine built for the cloud. Features include:

Distributed and Highly Available Search Engine.
- Each index is fully sharded with a configurable number of shards.
- Each shard can have one or more replicas.
- Read / Search operations performed on either one of the replica shard.
Multi Tenant with Multi Types.
- Support for more than one index.
- Support for more than one type per index.
- Index level configuration (number of shards, index storage, ...).
Various set of APIs
- HTTP RESTful API
- Native Java API.
- All APIs perform automatic node operation rerouting.
Document oriented
- No need for upfront schema definition.
- Schema can be defined per type for customization of the indexing process.
Reliable, Asynchronous Write Behind for long term persistency.
(Near) Real Time Search.
Built on top of Lucene
- Each shard is a fully functional Lucene index
- All the power of Lucene easily exposed through simple configuration / plugins.
Per operation consistency
- Single document level operations are atomic, consistent, isolated and durable.
Open Source under the Apache License, version 2 ("ALv2")

This site uses Elastic Search for it's search functionality under the hood.

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