pySASIncrementalIndexer queue processor fails frequently with the below error

Note: I removed the data class name

<pxException>com.pega.platform.executor.queueprocessor.QueueProcessorException: The service crashed while indexing instances of 'Data class name'. HTTP response '500 Internal Server Error': {"message":"Internal Server Error"}
From: (BKM4Q76GHGV0PI824THOVZRJPPU1WJXUGA)
at com.pega.dsm.dnode.impl.dataflow.asyncexecutor.execution.QPExecution.run(QPExecution.java:80)
at com.pega.dsm.dnode.impl.dataflow.asyncexecutor.QueueProcessorExecutor.execute(QueueProcessorExecutor.java:113)
at com.pega.dsm.dnode.impl.dataflow.asyncexecutor.QueueProcessorOnlyOnceExecutionStrategy.run(QueueProcessorOnlyOnceExecutionStrategy.java:166)
at com.pega.dsm.dnode.impl.dataflow.asyncexecutor.QueueProcessorOnlyOnceExecutionStrategy.lambda$execute$0(QueueProcessorOnlyOnceExecutionStrategy.java:105)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1380)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1123)
at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1004)
at com.pega.pegarules.session.internal.PRSessionProviderImplForModules.doWithRequestorLocked(PRSessionProviderImplForModules.java:83)
at com.pega.dsm.dnode.impl.dataflow.asyncexecutor.QueueProcessorOnlyOnceExecutionStrategy.execute(QueueProcessorOnlyOnceExecutionStrategy.java:93)
at com.pega.platform.executor.internal.LogContextDecorator.runInDecoratedScope(LogContextDecorator.java:38)
at com.pega.dsm.dnode.impl.dataflow.asyncexecutor.QueueProcessorDataFlowFactory$1$1.onNext(QueueProcessorDataFlowFactory.java:91)
at com.pega.dsm.dnode.impl.dataflow.asyncexecutor.QueueProcessorDataFlowFactory$1$1.onNext(QueueProcessorDataFlowFactory.java:79)
at com.pega.dsm.dnode.api.dataflow.DataFlowStage$StageInputSubscriber.onNext(DataFlowStage.java:478)
at com.pega.dsm.dnode.api.dataflow.DataFlowStage$StageInputSubscriber.onNext(DataFlowStage.java:405)
at com.pega.dsm.dnode.api.dataflow.DataFlowExecutor$QueueBasedDataFlowExecutor$2.process(DataFlowExecutor.java:327)
at com.pega.dsm.dnode.api.dataflow.DataFlowExecutor$QueueBasedDataFlowExecutor.runEventLoop(DataFlowExecutor.java:218)
at com.pega.dsm.dnode.api.dataflow.DataFlow$2.emit(DataFlow.java:331)
at com.pega.dsm.dnode.impl.stream.DataObservableImpl.subscribe(DataObservableImpl.java:59)
at com.pega.dsm.dnode.impl.dataflow.task.strategy.ExecutionStrategy.executeDataFlow(ExecutionStrategy.java:125)
at com.pega.dsm.dnode.impl.dataflow.task.strategy.MultiplePartitionExecution.executePartitions(MultiplePartitionExecution.java:87)
at com.pega.dsm.dnode.impl.dataflow.service.run.ExecutePartitionsRunnable.executeDataFlowWithPartitions(ExecutePartitionsRunnable.java:86)
at com.pega.dsm.dnode.impl.dataflow.service.run.ExecutePartitionsRunnable.access$900(ExecutePartitionsRunnable.java:34)
at com.pega.dsm.dnode.impl.dataflow.service.run.ExecutePartitionsRunnable$1.run(ExecutePartitionsRunnable.java:67)
at com.pega.dsm.dnode.impl.dataflow.service.run.ExecutePartitionsRunnable$1.run(ExecutePartitionsRunnable.java:62)
at com.pega.dsm.dnode.util.PrpcRunnable.execute(PrpcRunnable.java:67)
at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContextInternal(ServiceHelper.java:305)
at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContext(ServiceHelper.java:150)
at com.pega.dsm.dnode.impl.dataflow.service.run.ExecutePartitionsRunnable.call(ExecutePartitionsRunnable.java:62)
at com.pega.dsm.dnode.impl.dataflow.service.run.ExecutePartitionsRunnable.call(ExecutePartitionsRunnable.java:34)
at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:108)
at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:41)
at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:77)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at com.pega.dsm.dnode.util.PrpcRunnable$1.run(PrpcRunnable.java:59)
at com.pega.dsm.dnode.util.PrpcRunnable$1.run(PrpcRunnable.java:56)
at com.pega.dsm.dnode.util.PrpcRunnable.execute(PrpcRunnable.java:67)
at com.pega.dsm.dnode.impl.prpc.P