curl -XPUT "localhost:9200/_river/articles/_meta" -d '
{
"type": "mongodb",
"mongodb": {
"servers": [
{ "host": "localhost", "port": 27017 }
],
"options": { "secondary_read_preference": true },
"db": "demo",
"collection": "articles"
},
"index": {
"name": "articles",
"type": "articles"
}
}'