[post] How Elasticsearch aggregation and Lucene facet work internally - Githubissues

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[post] How Elasticsearch aggregation and Lucene facet work internally #60

Open at15 opened 1 year ago

at15 commented 1 year ago

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request post from @at15

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Description

ES has (multiple) aggregation. Lucene (and Solr) has facet.

Need to explain

What is facet search and aggregation
What format is used for faster aggregation (inverted index is not the one) https://www.elastic.co/blog/sparse-versus-dense-document-values-with-apache-lucene
How does ES run the aggregation in a distributed manner, some common operations, e.g. topN, groupBy. Similarity and difference with distributed database & query engines.

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