Elasticsearch easy
Elasticsearch is best described as a distributed management wrapper around which powerful open-source search engine library?
- A Apache Spark
- B SQLite
- C Apache Lucene
- D Redis Labs
Answer: C. Apache Lucene
Elasticsearch handles the 'Distributed' part (clustering, shards, high availability API), while Lucene handles the 'Engine' part (the actual creation of inverted index files on disk and the math for relevance scoring).
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- What are the two primary reasons for configuring one or more 'Replica Shards' for an index?
- When a String field is mapped as `text`, what process is performed to enable full-text search capability?
- What is the primary benefit of splitting an Elasticsearch index into multiple 'Primary Shards'?
- Every document stored in an Elasticsearch index is uniquely tracked by which mandatory metadata field?
- Elasticsearch search results include a metadata field called `_score`. What does this value primarily indicate?
- What is the primary architectural purpose of Elasticsearch in a modern software stack?