@type problems with ES HTTP output

logstash-es-http-output-type-problem.txt

Config
======

input {
  redis {
    batch_count => 1
    codec => "plain"
    data_type => "list"
    db => 0
    host => "localhost"
    key => "logstash"
    port => 6379
    threads => 1
    timeout => 5
  }
}

output {
    elasticsearch_http {
        host => "localhost"
        template_overwrite => false
        manage_template => false
        index => "logstash-%{+YYYY.MM}"
        flush_size => 1
        index_type => "%{@type}"
  }
}

Sample data
===========

{
    "@event_class": "event_basket",
    "@fields": {
        <fields here>
    },
    "@message": "Basket event",
    "@source": "unknown",
    "@tags": [],
    "@timestamp": "2014-06-06T09:27:35+00:00",
    "@type": "event_basket"
}