[post] How Elasticsearch aggregation and Lucene facet work internally #60
Description
Type
- request post from @at15
Related
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.