This commit introduces a new _ingest/simulate API that runs any pipelines
on the given data that would be executed for a given index, but instead of
indexing the data into the index, returns the transformed documents and
the list of pipelines that were executed.
This PR adds documentation for GeoIPv2 auto-update feature.
It also changes related settings names from geoip.downloader.* to ingest.geoip.downloader to have the same convention as current setting.
Relates to #68920
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
Co-authored-by: James Rodewig <40268737+jrodewig@users.noreply.github.com>
