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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:
When you add data to Elasticsearch, it is analyzed (parsed, normalized, and enriched), and stored into an inverted index.
The inverted index is a data structure designed for fast full-text searches. It keeps track of all unique words and in which documents each word appears.
It's called inverted because it inverts a document-centric data structure (document -> words) to a keyword-centric data structure (word -> documents).
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