kafka-source-connector | Sample Source Connector for Kafka Connect | Pub Sub library

I tried to load a simple Kafka connector in Connect Cluster. I created jar for the connector and started Kafka Connect as a docker. In the logs I can see that it's loading the plugin. Docker mounts jar file properly. However when calling http://localhost:8083/connector-plugins my custom connector is not on the list.

I have simply built and started docker-compose from this repo: https://github.com/riferrei/kafka-source-connector. Avalable plugin list I have is: [{"class":"io.confluent.connect.activemq.ActiveMQSourceConnector","type":"source","version":"5.5.0"},{"class":"io.confluent.connect.elasticsearch.ElasticsearchSinkConnector","type":"sink","version":"5.5.0"},{"class":"io.confluent.connect.ibm.mq.IbmMQSourceConnector","type":"source","version":"5.5.0"},{"class":"io.confluent.connect.jdbc.JdbcSinkConnector","type":"sink","version":"5.5.0"},{"class":"io.confluent.connect.jdbc.JdbcSourceConnector","type":"source","version":"5.5.0"},{"class":"io.confluent.connect.jms.JmsSourceConnector","type":"source","version":"5.5.0"},{"class":"io.confluent.connect.s3.S3SinkConnector","type":"sink","version":"5.5.0"},{"class":"io.confluent.connect.storage.tools.SchemaSourceConnector","type":"source","version":"5.5.0-ccs"},{"class":"org.apache.kafka.connect.file.FileStreamSinkConnector","type":"sink","version":"5.5.0-ccs"},{"class":"org.apache.kafka.connect.file.FileStreamSourceConnector","type":"source","version":"5.5.0-ccs"},{"class":"org.apache.kafka.connect.mirror.MirrorCheckpointConnector","type":"source","version":"1"},{"class":"org.apache.kafka.connect.mirror.MirrorHeartbeatConnector","type":"source","version":"1"},{"class":"org.apache.kafka.connect.mirror.MirrorSourceConnector","type":"source","version":"1"}]

Does anyone have an idea what could be an issue that the connector is not on the list? Or a hint what could I check?

Context: I followed this link on setting up AWS MSK and testing a producer and consumer and it is setup and working correctly. I am able to send and receive messages via 2 separate EC2 instances that both use the same Kafka cluster (My MSK cluster). Now, I would like to establish a data pipeline all the way from Eventhubs to AWS Firehose which follows the form:

Azure Eventhub -> Eventhub-to-Kafka Camel Connector -> AWS MSK -> Kafka-to-Kinesis-Firehose Camel Connector -> AWS Kinesis Firehose

I was able to successfully do this without the use of MSK (via regular old Kafka) but for unstated reasons need to use MSK now and I can't get it working.

Problem: When trying to start the connectors between AWS MSK and the two Camel connectors I am using, I get the following error:

These are the two connectors in question:

1. AWS Kinesis Firehose to Kafka Connector (Kafka -> Consumer)
2. Azure Eventhubs to Kafka Connector (Producer -> Kafka)

Goal: Get these connectors to work with the MSK, like they did without it, when they were working directly with Kafka.

Here is the issue for Firehose: