Navigating inside a folder with Web UI on an upgraded instance generates ESAuditBackend errors

15:41:19,598 ERROR [ESAuditBackend] Unable to index audit entry 0 :MapperParsingException[object mapping for [extended.searchDocumentModel] tried to parse field [searchDocumentModel] as object, but found a concrete value]
15:41:19,599 ERROR [ESAuditBackend] Unable to index audit entry 1 :MapperParsingException[object mapping for [extended.searchDocumentModel] tried to parse field [searchDocumentModel] as object, but found a concrete value]
15:41:19,599 ERROR [ESAuditBackend] Unable to index audit entry 2 :MapperParsingException[object mapping for [extended.searchDocumentModel] tried to parse field [searchDocumentModel] as object, but found a concrete value]