Heya,
We just released mapper attachments plugin 1.8.0 for Elasticsearch: https://github.com/elasticsearch/elasticsearch-mapper-attachments
If you are using elasticsearch 0.90.3, you need to update to 1.8.0: #34
Full list is here: https://github.com/elasticsearch/elasticsearch-mapper-attachments/issues?labels=1.8.0&state=closed
Have fun!
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David Pilato | Technical Advocate | Elasticsearch.com
@dadoonet | @elasticsearchfr | @scrutmydocs