Mapping Wikipedia dump: mapper_parsing_exception


I am trying to put Wikipedia cirrus-mapping-dump into an index template, but I am encountering this error:

Unfortunately, I can't pinpoint the unsupported parameters as the mapping is quite large and not sure which version of Elasticsearch Wikipedia is using.
I appreciate any help or hint regarding what in this mapping has been deprecated.

Env: Elasticsearch 6.3.1

Many thanks,

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