diff --git a/server/src/main/java/org/elasticsearch/threadpool/ThreadPool.java b/server/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
index 961a79a2c59a3..72ba8284d2420 100644
--- a/server/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
+++ b/server/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
@@ -559,7 +559,7 @@ static int twiceAllocatedProcessors(final int allocatedProcessors) {
         return boundedBy(2 * allocatedProcessors, 2, Integer.MAX_VALUE);
     }
 
-    static int oneEighthAllocatedProcessors(final int allocatedProcessors) {
+    public static int oneEighthAllocatedProcessors(final int allocatedProcessors) {
         return boundedBy(allocatedProcessors / 8, 1, Integer.MAX_VALUE);
     }
 
diff --git a/x-pack/plugin/rollup/src/main/java/org/elasticsearch/xpack/rollup/Rollup.java b/x-pack/plugin/rollup/src/main/java/org/elasticsearch/xpack/rollup/Rollup.java
index 75843a51de7d5..20136b3e30e3f 100644
--- a/x-pack/plugin/rollup/src/main/java/org/elasticsearch/xpack/rollup/Rollup.java
+++ b/x-pack/plugin/rollup/src/main/java/org/elasticsearch/xpack/rollup/Rollup.java
@@ -177,7 +177,7 @@ public List<ExecutorBuilder<?>> getExecutorBuilders(Settings settingsToUse) {
         final FixedExecutorBuilder downsample = new FixedExecutorBuilder(
             settingsToUse,
             Rollup.DOWSAMPLE_TASK_THREAD_POOL_NAME,
-            ThreadPool.searchOrGetThreadPoolSize(EsExecutors.allocatedProcessors(settingsToUse)),
+            ThreadPool.oneEighthAllocatedProcessors(EsExecutors.allocatedProcessors(settingsToUse)),
             Rollup.DOWNSAMPLE_TASK_THREAD_POOL_QUEUE_SIZE,
             "xpack.downsample.thread_pool",
             false