Updated mediawiki/extensions
Project: mediawiki/extensions/CirrusSearch  d9bc28bf685026103d03292d42c6c5079f61cd77

Add comments about Elasticsearch prod config

We have some opinions on the right way to set up Elasticsearch for
CirrusSearch so we should make those public in the README.

Bug: 56165
Change-Id: I4f960684ad8412bb752d155ae49f7af17afb20c3