Creating the ActiveMQ river is as simple as:
curl -XPUT 'localhost:9200/_river/dsm/_meta' -d '{
"type" : "activemq",
"activemq" : {
"host" : "127.0.0.1",
"port" : 6163,
"user" : "guest",
"pass" : "guest",
"queue" : "/queue/nature/dsm"
}
}'