X-pack comes with the SQL features that provide SQL access in Elasticsearch to execute the queries. This SQL support feature has been introduced in Elasticsearch 6.3.
Basically, X-pack is an Elastic Stack extension with SQL features, which helps the users to execute the SQL queries against Elasticsearch. The SQL queries execute in a real-time environment and return the result in tabular form.
We can execute the Elasticsearch SQL command line using the elasticsearch-sql-cli.bat file that exists inside the bin folder. This Elasticsearch SQL translator can understand both SQL as well as Elasticsearch.
