NoClassDefFoundError when using the html_strip char filter

Hello,

I'm using the html_strip char filter in my mapping, and this gives me a
NoClassDefFoundError when indexing documents. See
https://gist.github.com/stof/fb8c0daa6dd7d6f2fae6 for a reproducing script
(and the output I got)
The same config used to work on an older 1.3 version of ElasticSearch.

Environment:

ElasticSearch 1.3.7 (installed from the apt repository) with the
mapper-attachment and marvel plugins enabled
java: OpenJDK Runtime Environment (IcedTea 2.5.3)
(7u71-2.5.3-0ubuntu0.14.04.1)
OS: Ubuntu 14.04

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