Send mail failed with "UnsupportedDataTypeException"

Elastic Stack Elasticsearch
5

Look at what they suggested in this thread: UnsupportedDataTypeException when trying to send email

This worked for me on the latest watcher, and ES 2.0.0 Stable:

    $ cd /usr/share/elasticsearch/plugins/watcher/
    $ sudo mv activation-1.1.1.jar ../../lib/
    $ sudo mv javax.mail-1.5.3.jar ../../lib/
    $ sudo service elasticsearch restart
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