Right now, the way to push an update is to publish it to the ajax update site
and a user can get it by choosing the Download additional server adapters link
in the New Server wizard.
The question was raised as to why it is not shown from the Help->Software
updates list. I was able to get it to show up there by adding
https://ajax.dev.java.net/eclipse to the list of update sites.
Should the plugin automatically add this site to the list of update sites when
it is installed? Or is this counter to how server adapters are meant to be
updated? Or is the Download additional server adapters code already going
somewhere (besides the ajax site) that should be in the list of update sites?