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Terminology
  • Node = An Elasticsearch process. It's recommended to run each node on a separate server.
  • Cluster = Set of one or more nodes.
  • Shard = Part of an index, used for distributing data across the cluster.

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πŸ“– Elasticsearch in Action

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Elasticsearch and Lucene

Elasticsearch is a distributed search and analytics engine, built on top of Lucene. It provides a JSON-based REST API and supports sharding, replication, and cluster management, for high availability.

Lucene is a high-performance search engine library, written in Java. It provides fast and memory efficient text indexing (20-30% of the original text size), and powerful search algorithms:

  • Ranked and faceted searching
  • Text highlighting
  • Autocomplete
  • Suggesters ("Did you mean?")
  • Spell checkers
  • Aggregations

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