Connecting Neo4j to Siren platform

I've installed Neo4j and I wanted to connect it to Siren platform using JDBC Driver. But when I create ontalogy in datasource reflection jobs:
[parse_exception] request body is required :: {"path":"/.siren/_bulk","query":{"refresh":"wait_for"},"body":"","statusCode":400,"response":"{"error":{"root_cause":[{"type":"parse_exception","reason":"request body is required"}],"type":"parse_exception","reason":"request body is required"},"status":400}"} l
Thanks for your help

What is your query or code?