Failed to execute phase [fetch],	at org.elasticsearch.server@9.2.0/org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseFailure(AbstractSearchAsyncAction.java:624)	at org.elasticsearch.server@9.2.0/org.elasticsearch.action.search.SearchQueryThenFetchAsyncAction.onPhaseFailure(SearchQueryThenFetchAsyncAction.java:81)	at org.elasticsearch.server@9.2.0/org.elasticsearch.action.search.FetchSearchPhase$1.onFailure(FetchSearchPhase.java:88)	at org.elasticsearch.server@9.2.0/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:29)	at org.elasticsearch.server@9.2.0/org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:35)	at org.elasticsearch.server@9.2.0/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:1067)	at org.elasticsearch.server@9.2.0/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27)	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1095)	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:619)	at java.base/java.lang.Thread.run(Thread.java:1447) Caused by: java.lang.ClassCastException: class org.elasticsearch.search.aggregations.bucket.filter.InternalFilter cannot be cast to class org.elasticsearch.search.aggregations.InternalMultiBucketAggregation (org.elasticsearch.search.aggregations.bucket.filter.InternalFilter and org.elasticsearch.search.aggregations.InternalMultiBucketAggregation are in module org.elasticsearch.server@9.2.0 of loader 'app')	at org.elasticsearch.server@9.2.0/org.elasticsearch.search.aggregations.pipeline.BucketScriptPipelineAggregator.reduce(BucketScriptPipelineAggregator.java:52)	at org.elasticsearch.server@9.2.0/org.elasticsearch.search.aggregations.InternalAggregation.reducePipelines(InternalAggregation.java:119)	at org.elasticsearch.server@9.2.0/org.elasticsearch.search.aggregations.bucket.InternalSingleBucketAggregation.reducePipelines(InternalSingleBucketAggregation.java:142)	at org.elasticsearch.server@9.2.0/org.elasticsearch.search.aggregations.InternalAggregations.lambda$maybeExecuteFinalReduce$0(InternalAggregations.java:197)	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:215)	at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:722)	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:727)	at org.elasticsearch.server@9.2.0/org.elasticsearch.search.aggregations.InternalAggregations.maybeExecuteFinalReduce(InternalAggregations.java:198)	at org.elasticsearch.server@9.2.0/org.elasticsearch.search.aggregations.InternalAggregations.topLevelReduce(InternalAggregations.java:187)	at org.elasticsearch.server@9.2.0/org.elasticsearch.action.search.QueryPhaseResultConsumer.aggregate(QueryPhaseResultConsumer.java:412)	at org.elasticsearch.server@9.2.0/org.elasticsearch.action.search.QueryPhaseResultConsumer.reduce(QueryPhaseResultConsumer.java:250)	at org.elasticsearch.server@9.2.0/org.elasticsearch.action.search.FetchSearchPhase.innerRun(FetchSearchPhase.java:96)	at org.elasticsearch.server@9.2.0/org.elasticsearch.action.search.FetchSearchPhase$1.doRun(FetchSearchPhase.java:83) 

{ "size": 0, "aggs": { "by_birth_year": { "filter": { "term": { "gender": "M" } }, "aggs": { "sum_languages": { "sum": { "field": "languages" } }, "squared": { "bucket_script": { "buckets_path": { "sum_languages": "sum_languages" }, "script": "params.sum_languages * params.sum_languages" } } } } } }