Our recently migrated wikibase https://beyond-notability.wikibase.cloud/wiki/Main_Page is one of those with Elasticsearch turned on. However, we've noticed that recent additions (e.g. https://beyond-notability.wikibase.cloud/wiki/Item:Q1153) are not being indexed - that is, whilst we can search for pre-migration items without using exact Q numbers, we can't do the same for new additions.
Looking at that email "Important information about your Wikibase.cloud migration" sent June 10, this error is not explicitly described as part of the 'degraded experience' that was expected for some users.
I appreciate wikibase cloud are expereince Elasticsearch issues, but it seemed worth logging this issue.