ES|QL: java.lang.ClassCastException is serverless when loading fields #138009
Description
We seem to be getting these fairly frequently in Serverless - this appears to be happening when reading stored fields (probably _source?)
java.lang.ClassCastException: class java.lang.String cannot be cast to class org.apache.lucene.util.BytesRef (java.lang.String is in module java.base of loader 'bootstrap'; org.apache.lucene.util.BytesRef is in module [email protected] of loader 'app') at [email protected]/org.elasticsearch.index.mapper.BlockStoredFieldsReader$BytesFromBytesRefsBlockLoader$1.toBytesRef(BlockStoredFieldsReader.java:85) at [email protected]/org.elasticsearch.index.mapper.BlockStoredFieldsReader$Bytes.read(BlockStoredFieldsReader.java:133) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader$RowStrideReaderWork.read(ValuesFromSingleReader.java:216) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.loadFromRowStrideReaders(ValuesFromSingleReader.java:168) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.loadFromSingleLeaf(ValuesFromSingleReader.java:112) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.load(ValuesFromSingleReader.java:58) at org.elasticsearch.compute.lucene.read.ValuesReader.next(ValuesReader.java:38) at org.elasticsearch.compute.lucene.read.ValuesReader.next(ValuesReader.java:18) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$AppendBlocksIterator.next(AbstractPageMappingToIteratorOperator.java:345) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$AppendBlocksIterator.next(AbstractPageMappingToIteratorOperator.java:321) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$RuntimeTrackingIterator.next(AbstractPageMappingToIteratorOperator.java:190) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$RuntimeTrackingIterator.next(AbstractPageMappingToIteratorOperator.java:175) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator.getOutput(AbstractPageMappingToIteratorOperator.java:149) at org.elasticsearch.compute.operator.Driver.runSingleLoopIteration(Driver.java:280) at org.elasticsearch.compute.operator.Driver.run(Driver.java:191) at org.elasticsearch.compute.operator.Driver$1.doRun(Driver.java:428) at [email protected]/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at org.elasticsearch.compute.operator.DriverScheduler$1.doRun(DriverScheduler.java:57) at [email protected]/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at [email protected]/org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:35) at [email protected]/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:1076) at [email protected]/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614) at java.base/java.lang.Thread.run(Thread.java:1474)