"Indexing Metadata Information" is inaccurate

https://docs.couchbase.com/server/5.5/n1ql/n1ql-language-reference/indexing-meta-info.html
https://docs.couchbase.com/server/6.0/n1ql/n1ql-language-reference/indexing-meta-info.html

Above articles mention indexable meta() attributes as .cas, .expiration, .flags, .id and .type
But only indexable meta() fields are "id", "expiration", "cas", "xattrs" . In case of xattrs, it is specific field with xattr. We dont allow indexing on flags and type.

Above documentation needs to fixed. Also indexing on flags/type gives error -
Expression not indexable: (meta().`type`) - at )