Problems with _bulk indexing

Elastic Stack Elasticsearch
1

Hi All,

Here is a sample _bulk request which is failing:
curl -X PUT "http://localhost:9200/_bulk" -d '{ "index" : { "_index" : "profusion_db", "_type" : "service_index", "_id" : "1" } }
{ "field1" : "value1" }
'

{"error":"[_bulk] Invalid index name [bulk], must not start with ''"}

Any ideas what I'm doing wrong?