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In a few previous PR's we restructured the ES|QL docs to make it possible to generate them dynamically. This PR just moves a few files around to make the query languages docs easier to work with, and a little more organized like the ES|QL docs. A bit part of this was setting up redirects to the new locations, so other repo's could correctly link to the elasticsearch docs.
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System Functions [sql-functions-system]
These functions return metadata type of information about the system being queried.
DATABASE [sql-functions-system-database]
DATABASE()
Input: none
Output: string
Description: Returns the name of the database being queried. In the case of Elasticsearch SQL, this is the name of the Elasticsearch cluster. This function should always return a non-null value.
SELECT DATABASE();
DATABASE
---------------
elasticsearch
USER [sql-functions-system-user]
USER()
Input: none
Output: string
Description: Returns the username of the authenticated user executing the query. This function can return null in case security is disabled.
SELECT USER();
USER
---------------
elastic