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https://issues.apache.org/jira/browse/NIFI-4743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16378734#comment-16378734
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Robert Bruno commented on NIFI-4743:
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Added two files that I use for my patch if it helps. Of course would need to
be tested. It adds a processor property that let's you chose how to treat
nulls. I copied the code for the jsonrecordsetwriter.
> Suppress Nulls for PutElasticsearchHttpRecord
> ---------------------------------------------
>
> Key: NIFI-4743
> URL: https://issues.apache.org/jira/browse/NIFI-4743
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Reporter: Robert Bruno
> Priority: Minor
> Attachments: NullSuppression.java, PutElasticsearchHttpRecord.java
>
>
> Would be useful for PutElasticsearchHttpRecord to allow you to suppress NULL
> values in the JSON that is inserted into ES much like the JsonRecordSetWriter
> allows you to do. Perhaps PutElasticsearchHttpRecord could some how make use
> of JsonRecordSetWriter so it would inherit this functionality.
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