Log when there are too many requests errors

[yeikel]

When TOO_MANY_REQUESTS happen, the connector does not seem to log this as the error is bubbled up to Kafka connect instead

It would be useful if we could log that type of failures as an error as well similar to how we long it when there are timeouts

org.apache.kafka.connect.errors.ConnectException: Exiting WorkerSinkTask due to unrecoverable exception. at 
org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:618) at 
org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:334) at 
org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:235) at 
org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:204) at 
org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:201) at 
org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:256) 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.kafka.connect.errors.ConnectException: Indexing record failed. at 
io.confluent.connect.elasticsearch.ElasticsearchClient.handleResponse(ElasticsearchClient.java:639) at 
io.confluent.connect.elasticsearch.ElasticsearchClient$1.afterBulk(ElasticsearchClient.java:428) at 
org.elasticsearch.action.bulk.BulkRequestHandler$1.onResponse(BulkRequestHandler.java:59) at 
org.elasticsearch.action.bulk.BulkRequestHandler$1.onResponse(BulkRequestHandler.java:56) at 
org.elasticsearch.action.ActionListener$RunAfterActionListener.onResponse(ActionListener.java:341) at 
org.elasticsearch.action.bulk.Retry$RetryHandler.finishHim(Retry.java:168) at 
org.elasticsearch.action.bulk.Retry$RetryHandler.onResponse(Retry.java:112) at 
org.elasticsearch.action.bulk.Retry$RetryHandler.onResponse(Retry.java:71) at 
io.confluent.connect.elasticsearch.ElasticsearchClient.lambda$null$1(ElasticsearchClient.java:214) ... 5 more Caused by: java.lang.Throwable: Response status: 'TOO_MANY_REQUESTS', Index: 'xxx', Document Id: yyyy'. ... 14 more