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https://issues.apache.org/jira/browse/NIFI-1927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442874#comment-16442874
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Matt Burgess commented on NIFI-1927:
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[~JPercivall] Does NIFI-4149 satisfy your use case? If so can we close/resolve
this one as a duplicate?
> Improve documentation of property's ability to use Expression Languages
> -----------------------------------------------------------------------
>
> Key: NIFI-1927
> URL: https://issues.apache.org/jira/browse/NIFI-1927
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Joseph Percivall
> Priority: Major
>
> Currently in the documentation for properties there is a simple true/false on
> whether or not Expression Language(EL) is supported for that property. This
> trivializes the extent of EL and for some hides some functionality. There are
> multiple different options when deciding to evaluate EL, the most relevant to
> the user are: whether or not a FlowFile is used and if there are any extra
> key/value pairs exposed.
> The documentation should be explicit so that the user knows what will get
> evaluated and what is exposed.
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