From 8e0037f193e5089891a03723a3b1a07d5d1bb88c Mon Sep 17 00:00:00 2001
From: Ignacio Vera <ignacio.vera@elastic.co>
Date: Sun, 5 Jan 2025 13:03:54 +0100
Subject: [PATCH] Construct list manually in AggregatorsReducer#get (#119565)

---
 .../search/aggregations/AggregatorsReducer.java        | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/server/src/main/java/org/elasticsearch/search/aggregations/AggregatorsReducer.java b/server/src/main/java/org/elasticsearch/search/aggregations/AggregatorsReducer.java
index 6682fb2a83418..4c89877b7b1c6 100644
--- a/server/src/main/java/org/elasticsearch/search/aggregations/AggregatorsReducer.java
+++ b/server/src/main/java/org/elasticsearch/search/aggregations/AggregatorsReducer.java
@@ -12,7 +12,10 @@
 import org.elasticsearch.core.Releasable;
 import org.elasticsearch.core.Releasables;
 
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -54,7 +57,12 @@ public void accept(InternalAggregations aggregations) {
      * returns the reduced {@link InternalAggregations}.
      */
     public InternalAggregations get() {
-        return InternalAggregations.from(aggByName.values().stream().map(AggregatorReducer::get).toList());
+        final Collection<AggregatorReducer> reducers = aggByName.values();
+        final List<InternalAggregation> aggs = new ArrayList<>(reducers.size());
+        for (AggregatorReducer reducer : reducers) {
+            aggs.add(reducer.get());
+        }
+        return InternalAggregations.from(aggs);
     }
 
     @Override