When you search on the internet about say, Apple. It could either display the search results about fruit or company with name as an Apple. You may want to buy fruit online, check the recipe from the fruit or health benefits of eating fruit, apple.
In contrast, you may want to check Apple.com to find the latest product range offered by the company, check Apple Inc.’s stock prices and how a company is performing in NASDAQ in the last 6 months, 1 or 5 years.
Similarly, when we search for a document (a record) from Elasticsearch, you are interested in getting the relevant information that you are looking for. Based on the relevance, the probability of getting the relevant information is calculated by the Lucene scoring algorithm.
The Lucene technology helps to search a particular record i.e. document which is indexed based on the frequency of the term in search appearing in the document, how often its appearance across an index and query which is designed using various parameters.
