Crashing Logstash S3 output - NotImplementedError fstat error at startup in 5.2+ on Alpine

OS: Alpine 3.6
Logstash 5.2+
Plugin: logstash-output-s3
Java: OpenJDK-

Prior to Logstash 5.2, context.http_request.body (as seen in /usr/share/logstash/vendor/bundle/jruby/1.9/gems/aws-sdk-core-2.3.22/lib/aws-sdk-core/plugins/s3_expect_100_continue.rb) returned a STRINGIO object and .size, which is called on this object, works OK.

However, from 5.2 onwards context.http_request.body is a File and .size is throwing an error.

NotImplementedError: fstat unimplemented unsupported or native support failed to load
size at org/jruby/
call at /usr/share/logstash/vendor/bundle/jruby/1.9/gems/aws-sdk-core-2.3.22/lib/aws-sdk-core/plugins/s3_expect_100_continue.rb:15

Only seems to error in Alpine as I've tried it in Ubuntu and all seems OK.

Are additional components required for the Alpine install in order to use 5.2 onwards?

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