Abstract Algorithms

elasticsearch

3 articles across 3 sub-topics

Understanding Inverted Index and Its Benefits in Software Development

TLDR TLDR: An Inverted Index maps every word to the list of documents containing it — the same structure as the back-of-the-book index. It is the core data structure behind every full-text search engine, including Elasticsearch, Lucene, and PostgreS...

Mar 9, 2026•14 min read

Inverted-index(1)

How Apache Lucene Works: The Engine Behind Elasticsearch

TLDR: Lucene is a search library. Its core innovation is the inverted index — a reverse map from words to documents, like the index at the back of a textbook. Documents are stored in immutable segments that Lucene merges in the background to keep que...

Mar 9, 2026•13 min read

Databases(1)

Elasticsearch vs Time-Series DB: Key Differences Explained

TLDR: Elasticsearch is built for search — full-text log queries, fuzzy matching, and relevance ranking via an inverted index. InfluxDB and Prometheus are built for metrics — numeric time series with aggressive compression. Picking the wrong one waste...

Mar 9, 2026•13 min read