[8.0] Fix GeoIpDownloader startup during rolling upgrade (#84000) #84032
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If rolling upgrade was used from version prior GeoIPv2 (<`7.14`) then geoip downloader wouldn't be started so no new databases were downloaded. This is especially troubling in `8.x` as we no longer provide default databases inside ES so after upgrade no geoip enrichment can take place until downloader is started with workaround (setting `ingest.geoip.downloader.enabled` to `false` and `true` again). This is because logic that was used to lower number of requests / cluster update listeners at the startup was too optimistic about order of actions / who can be elected master at what time. This change fixes that and also cleans up logs when there are some ignorable errors and adds debug logging on start and stop of the task to ease up troubleshooting. It also adds rolling upgrade test to make sure the fix works.
probakowski
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Backports the following commits to 8.0: