java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class

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java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class
at org.elasticsearch.spark.rdd.AbstractEsRDDIterator.(AbstractEsRDDIterator.scala:28)
at org.elasticsearch.spark.rdd.ScalaEsRDDIterator.(ScalaEsRDD.scala:43)

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