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scala/collection/GenTraversableOnce$class
java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class	at org.elasticsearch.spark.rdd.AbstractEsRDDIterator.(AbstractEsRDDIterator.scala:13)	at org.elasticsearch.spark.rdd.ScalaEsRDDIterator.(ScalaEsRDD.scala:25)	at org.elasticsearch.spark.rdd.ScalaEsRDD.compute(ScalaEsRDD.scala:21)	at org.elasticsearch.spark.rdd.ScalaEsRDD.compute(ScalaEsRDD.scala:15)	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:277)	at org.apache.spark.rdd.RDD.iterator(RDD.scala:244)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:61)	at org.apache.spark.scheduler.Task.run(Task.scala:64)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:203)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)