Incorrect error code in ingest when validation failed

[Skryabind]

How to reproduce:
Send POST request to /api/v1/ingest with incorrect stream name in x-p-stream, for example:
x-p-stream = testStream.

Expected behavior: Receive 400 Bad Reqeust error

Actual behavior: Received 500 Internal Server Error

[nitisht]

Thanks @Skryabind . We'll take a look