FHIR Source Connector config fails ro resolve endpoint

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I want to add a source connector for polling Bundles from a FHIR API. Therefore I put together the following config:

```json
{
"name": "my-fhir-source-connector",
"config": {
"connector.class": "org.apache.camel.kafkaconnector.fhir.CamelFhirSourceConnector",
"tasks.max": 1,
"topic": "fhir.input",
"camel.source.path.apiName": "OPERATION",
"camel.source.path.methodName": "$customOperation",
"camel.source.endpoint.serverUrl": "https://url-of-fhir-api-com/fhir",
"camel.source.endpoint.delay": 60000,
"camel.source.endpoint.password": "password",
"camel.source.endpoint.username": "user",
"camel.component.fhir.fhirVersion": "R4"
}
}
```

(This results in the error message listed at the end.)

The `$customOperation` returns a Collection Bundle.
Manually I am able to query this bundle by doing a POST on:
`https://url-of-fhir-api-com/fhir/$customOperation`
with a request body:

```xml

```

1. But I see no possibility to add a request body to the connector config. I played around with `camel.source.endpoint.inBody` but cannot get any result. How can I add parameters/body?

2. And another question is, if the endpoint URL is correct? Because it seems the connector constructs the URL like:
`https://url-of-fhir-api-com/fhir/operation/$customOperation`
instead of
`https://url-of-fhir-api-com/fhir/$customOperation`
Is this also a problem?

3. Also, the log does not show the full URL it is accessing. Does it ignore the `serverUrl` property?

The error log:

```sh
org.apache.kafka.connect.errors.ConnectException: Failed to create and start Camel context
at org.apache.camel.kafkaconnector.CamelSourceTask.start(CamelSourceTask.java:175)
at org.apache.kafka.connect.runtime.WorkerSourceTask.initializeAndStart(WorkerSourceTask.java:225)
at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:186)
at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:243)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.apache.camel.FailedToCreateRouteException: Failed to create route route1: Route(route1)[From[fhir:operation/$customOperation?dela... because of Failed to resolve endpoint: fhir://operation/$customOperation?delay=60000&password=xxxxxx due to: No matching method for operation/$customOperation, with arguments []
at org.apache.camel.reifier.RouteReifier.createRoute(RouteReifier.java:80)
at org.apache.camel.impl.DefaultModelReifierFactory.createRoute(DefaultModelReifierFactory.java:49)
at org.apache.camel.impl.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:826)
at org.apache.camel.impl.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:716)
at org.apache.camel.impl.engine.AbstractCamelContext.doInit(AbstractCamelContext.java:2757)
at org.apache.camel.support.service.BaseService.init(BaseService.java:83)
at org.apache.camel.impl.engine.AbstractCamelContext.init(AbstractCamelContext.java:2475)
at org.apache.camel.support.service.BaseService.start(BaseService.java:111)
at org.apache.camel.impl.engine.AbstractCamelContext.start(AbstractCamelContext.java:2494)
at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:245)
at org.apache.camel.main.SimpleMain.doStart(SimpleMain.java:43)
at org.apache.camel.support.service.BaseService.start(BaseService.java:119)
at org.apache.camel.kafkaconnector.CamelSourceTask.start(CamelSourceTask.java:172)
... 8 more
Caused by: org.apache.camel.ResolveEndpointFailedException: Failed to resolve endpoint: fhir://operation/$customOperation?delay=60000&password=xxxxxx due to: No matching method for operation/$customOperation, with arguments []
at org.apache.camel.impl.engine.AbstractCamelContext.doGetEndpoint(AbstractCamelContext.java:962)
at org.apache.camel.impl.engine.AbstractCamelContext.getEndpoint(AbstractCamelContext.java:844)
at org.apache.camel.support.CamelContextHelper.getMandatoryEndpoint(CamelContextHelper.java:58)
at org.apache.camel.reifier.AbstractReifier.resolveEndpoint(AbstractReifier.java:177)
at org.apache.camel.reifier.RouteReifier.doCreateRoute(RouteReifier.java:94)
at org.apache.camel.reifier.RouteReifier.createRoute(RouteReifier.java:74)
... 20 more
Caused by: java.lang.IllegalArgumentException: No matching method for operation/$customOperation, with arguments []
at org.apache.camel.support.component.AbstractApiEndpoint.initState(AbstractApiEndpoint.java:172)
at org.apache.camel.support.component.AbstractApiEndpoint.configureProperties(AbstractApiEndpoint.java:134)
at org.apache.camel.support.DefaultComponent.setProperties(DefaultComponent.java:425)
at org.apache.camel.support.component.AbstractApiComponent.createEndpoint(AbstractApiComponent.java:90)
at org.apache.camel.support.DefaultComponent.createEndpoint(DefaultComponent.java:171)
at org.apache.camel.impl.engine.AbstractCamelContext.doGetEndpoint(AbstractCamelContext.java:928)
... 25 more
```

Thanks in advance for any help or hints

Start with the supplied CamelFhirSourceConnector JSON and the endpoint-resolution stack trace. Inspect how the connector maps camel.source.path and camel.source.endpoint properties, then reproduce the generated fhir://operation/$customOperation endpoint. Done means the configuration behavior for the operation URL and request body is established and documented or corrected.

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