Kafka Connect Mongo Sink connector is failing due to schema - mongodb

Question

I'm doing my first steps in the kafka-connect area and things are not going as expected.
I created a Mongo sink connector (kafka to mongo), but it fails to consume the messages with the following error:
Task threw an uncaught and unrecoverable exception (org.apache.kafka.connect.runtime.WorkerTask)
org.apache.kafka.connect.errors.ConnectException: Tolerance exceeded in error handler
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:178)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execute(RetryWithToleranceOperator.java:104)
at org.apache.kafka.connect.runtime.WorkerSinkTask.convertAndTransformRecord(WorkerSinkTask.java:489)
at org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:469)
at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:325)
at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:228)
at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:196)
at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:184)
at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:234)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.kafka.connect.errors.DataException: Failed to deserialize data for topic test_topic to Avro:
at io.confluent.connect.avro.AvroConverter.toConnectData(AvroConverter.java:114)
at org.apache.kafka.connect.storage.Converter.toConnectData(Converter.java:87)
at org.apache.kafka.connect.runtime.WorkerSinkTask.lambda$convertAndTransformRecord$1(WorkerSinkTask.java:489)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndRetry(RetryWithToleranceOperator.java:128)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:162)
... 13 more
I don't wanna use any schema but for some reason it fails on the deserialize, probably because the schema config is missing.
My configurations:
{
"name": "kafka-to-mongo",
"config": {
"connector.class": "com.mongodb.kafka.connect.MongoSinkConnector",
"tasks.max": "1",
"topics": "test_topic",
"connection.uri": "mongodb://mongodb4:27017/test-db",
"database": "auto-resolve",
"value.converter.schemas.enable": "false",
"value.converter": "org.apache.kafka.connect.json.JsonConverter",
"collection": "test_collection",
"document.id.strategy": "com.mongodb.kafka.connect.sink.processor.id.strategy.PartialValueStrategy",
"document.id.strategy.partial.value.projection.list": "id",
"document.id.strategy.partial.value.projection.type": "AllowList",
"writemodel.strategy": "com.mongodb.kafka.connect.sink.writemodel.strategy.ReplaceOneBusinessKeyStrategy"
}
}
Example of a message in the topic:
{
"_id": "62a6e4d88c1e1e0011902616",
"type": "alert",
"key": "test444",
"timestamp": 1655104728,
"source_system": "api.test",
"tags": [
{
"type": "aaa",
"value": "bbb"
},
{
"type": "fff",
"value": "rrr"
}
],
"ack": "no",
"main": "nochange",
"all_ids": []
}
Any ideas? Thanks!