Before running our tests it would be great to have a prediction of what the change will do.
Erik has some ansible scripts that export indexes from prod and import them to a labs instance, and we recently added runSearch.php which allows running searches in bulk from the CLI by piping in a file full of queries. Should be that almost everything is ready to go, just have to throw a bunch of queries at it.
If lucky, the following command should run suggestions from a file on your local machine:
echo foo | ssh elasticsearch-tests.eqiad.wmflabs cd /srv/mediawiki-vagrant/ '&&' mwvagrant ssh -- mwscript extensions/CirrusSearch/maintenance/runSearch.php --type=suggest