ElasticSearch - Open Source, Distributed, RESTful Search Engine

ElasticSearch is an open source, distributed, RESTful search engine built on top of Lucene. Its features include:

  • Distributed and Highly Available Search Engine.
    • Each index is fully sharded with a configurable number of shards.
    • Each shard can have zero or more replicas.
    • Read / Search operations performed on either 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 Apache 2 License.

Check out the complete overview, download it, read the docs, and watch/fork it. Follow @elasticsearch for news and updates.