magento2.4 – Catalog Search index error After updating Magento 2.4.0 to 2.4.2

When I run php bin/magento indexer:reindex I get the following error message from the Catalog Search indexer:

{"error":{"root_cause":({"type":"mapper_parsing_exception","reason":"analyzer (sku) not found for field (sku)"}),"type":"mapper_parsing_exception","reason":"analyzer (sku) not found for field (sku)"},"status":400}

I have checked that elasticSearch 7 is connected and running. I have disabled a search autocomplete plugin (https://www.mageworx.com/magento-2-search-autocomplete-free.html) and that also did not resolve the issue.

I noticed some others had issues but mainly due to a mirasvit plugin which I do not have installed.