Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/2346
@rsomas Thanks for submitting a PR! Reading through the JIRA, I wanted to
get your take on possibly taking a slightly different approach as it appears
that the attribute that identifies the user may differ from provider to
provider. Since there does not appear to be anything in the discovery document
that specifies the attribute, what are your thoughts on adding a property to
the nifi.properties that does? This value would default to 'email' but could be
updated to suit any value that Identity Provider supports without requiring
additional code changes.
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