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The entry for commit f24649976 claimed that citext_pattern_ops could be used for LIKE index searches, but in fact it cannot. That patch only created the opclass and some related operators, without doing anything to teach the planner about how to use it. The opclass is basically useless in this unfinished state, which is why nothing was added to the main documentation about it, and really we shouldn't have said anything in the release notes either. So remove the entry. Discussion: https://postgr.es/m/CAKqncch4eBt2c8ddNVxzcVh3fFhdk54QoDMzpKgpqor4gA-wcQ@mail.gmail.com