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The number of object passed must be even but was [1]
java.lang.IllegalArgumentException: The number of object passed must be even but was [1]	at org.elasticsearch.action.index.IndexRequest.source(	at org.elasticsearch.action.index.IndexRequestBuilder.setSource(	at org.apache.kafka.connect.elasticsearchschema.ElasticsearchSinkTask.put(	at org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(	at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(	at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(	at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(	at org.apache.kafka.connect.runtime.WorkerTask.doRun(