Apache Flink 1.2 - Client is not connected to any Elasticsearch nodes

Hello everyone!
I'm new to ElasticSearch and I choosed it in order to perform data stream processing with Apache Flink using it as a Sink. Because Flink 1.2 has a connector only for the 2.x version of ES, i'm using a proper docker image (elasticsearch:2.4.4-alpine).
I followed the example on the docs using "elasticsearch" as cluster.name (being the default one) and as node address.
I launch my docker image with docker run -p 9200:9200 -e host.name= elasticsearch:2.4.4-alpine.
Sometimes the node receives something but it results in an IllegalArgumentException: empty text.

What is my mistake?
Thank you very much for your time!

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