We must continue to support the version of ES installed on elk.xwiki.org. Thus any code change need to be careful to not break that support.
The version on elk.xwiki.org can only be upgraded if all instances of XWiki in the world can successfully work with it (ie since the start of Active installs 2). Otherwise, we loose active installs
Consequence: We should add a functional test in the active installs maven module to verify that the version of XWiki when active installs 2 was introduced still works with the current active installs 2 code.
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