EPiServer Find Index – unknown property

This particular nugget has screwed with me for a few days. When attempting to run a standard EPiServer Find index, my log files were getting flooded with this:

An exception occurred while indexing (Content): MapperParsingException[failed to parse [Blocks.Items.Blocks.Items.DefaultPrice.UnitPrice.Currency]]; nested: ElasticSearchIllegalArgumentException[unknown property [CurrencyCode$$string]]; .

Contact episerver support to get them to move your index to a new cluster. In my case it was confirmed by EPiServer support that it was a timeout issue with regards to a bad cluster the index is sitting on.

Similar: https://support.episerver.com/hc/en-us/articles/115004105763-Find-Index-Timeout-with-OnPublish-Event

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