Elasticsearch is a search engine based on the Lucene library. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Elasticsearch is developed in Java.
Scoring TF/IDF with Elasticsrearch
The scoring is maybe the more game changing feature between SQL databases and Elasticsearch.
It works well by default for most use cases, but sooner or later you will want to know more about it
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