(Much delayed) thank you Costin. Indeed, on Ubuntu, changing ES_CLASSPATH to include hadoop and hadoop/lib directories in /etc/default/elasticsearch (and exporting it in /etc/init.d/elasticsearch) and installing light plugin version did work.
-- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to elasticsearch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/f3dc7f6a-3dc0-4793-af8e-ea4390540204%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.