Fingerprint plugin: make base64encode url friendly

I am using the fingerprint plugin to create custom _id fields that should be base64 encoded:

  fingerprint {
    key => "somekey"
    base64encode => true
    method => "SHA512"
    source => [ "username" ]
    target =>  "[@metadata][custom_id]"

   truncate {
    fields =>  "[@metadata][custom_id]"
    length_bytes => 20

However, here is an example key that was created:


The above is NOT url friendly therefore manipulation by id becomes cumbersome since it needs encoding/decoding.

Any suggestion to make the _id url friendly?

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