Ingest rename processor ignore empty

The ingest rename processor has an option ignore_missing which does not rename a field if the field is missing.

In some cases it would be helpful if the field would not be renamed if empty. E.g. with a new option ignore_empty.

Today it can be done with a if statement, but the option would be simpler and one more script could be avoided.

This sounds more like a feature request. I would recommend you to open an issue for this in the Beats repo if possible.

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