After 7.16.2, we'll no longer produce Windows MSI installer packages for Elasticsearch. These packages were previously released in beta and didn't receive widespread adoption.
### Changes:
* Adds a related 7.17 breaking change.
* Adds a related 7.16 deprecation.
* Removes the MSI installation instructions.
* Removes references to the MSI installer.
I plan to port the applicable changes to 8.1 (main), 8.0, 7.17, and 7.16. In the 7.16 ports, I'll leave in the MSI install docs and add related deprecation notes to them instead.
With the removal of support for older OSes, we no longer have any
supported systems which use SysV init. This commit removes support for
that legacy init system.
relates #51480
This commit changes the note in docs about required java version to note
the existence of the bundled jdk and how to bring your own java. It also
reorganizes the zip/targz docs as zip is no longer suitable on
Linux/MacOS.
