Problem description
While trying to add a custom schema or json for a given stream, if the name/type which is an optional field not provided the server sends an error 504 after 1 minute which is defalut timeout set by the loadbalancer. This happens as internally this is a required field and in case of protobuf and avro the same value gets populated by reading the schema provided with addSchema request but the same implementation for JSON and Custom is not there. And the code keeps on retying to addSchema as the exception thrown is retriable causing an endless retries till the 504 error is thrown.

Problem location
Add Schema API

Suggestions for an improvement
Add implementation for JSON and Custom schema types as well so that if the required but optional field is not sent with the request, it should be able to parse and use the same way it's doing for Avro and Protobuf types.