Correct. Sitecore and Solr don't have a field type to map a collection or an array of doubles or floats. These are the available multiValued field types automatically matched by Sitecore: <typeMatch typeName="guidCollection" type="System.Collections.Generic.List`1[System.Guid]" fieldNameFormat="{0}_sm" multiValued="true" ...


For me, the solution was obvious once I reviewed the Solr error logs. I was quickly able to see that one of my switch-on-rebuild collections was missing. Creating the missing collection solved the problem.

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