From 486cfb87332312e8ebff57aa20bc740481020ef7 Mon Sep 17 00:00:00 2001
From: Tim Brooks <tim@timbrooks.org>
Date: Tue, 28 May 2024 17:22:13 -0600
Subject: [PATCH] Use the unsafe future for read single region

We need to use the unsafe future to block on the same thread pool
similar to read multi regions.
---
 .../blobcache/shared/SharedBlobCacheService.java              | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/x-pack/plugin/blob-cache/src/main/java/org/elasticsearch/blobcache/shared/SharedBlobCacheService.java b/x-pack/plugin/blob-cache/src/main/java/org/elasticsearch/blobcache/shared/SharedBlobCacheService.java
index c5ef1d7c2bf1d..46cc2ee75bf3b 100644
--- a/x-pack/plugin/blob-cache/src/main/java/org/elasticsearch/blobcache/shared/SharedBlobCacheService.java
+++ b/x-pack/plugin/blob-cache/src/main/java/org/elasticsearch/blobcache/shared/SharedBlobCacheService.java
@@ -1116,7 +1116,9 @@ private int readSingleRegion(
             RangeMissingHandler writer,
             int region
         ) throws InterruptedException, ExecutionException {
-            final PlainActionFuture<Integer> readFuture = new PlainActionFuture<>();
+            final PlainActionFuture<Integer> readFuture =  new UnsafePlainActionFuture<>(
+                BlobStoreRepository.STATELESS_SHARD_PREWARMING_THREAD_NAME
+            );
             final CacheFileRegion fileRegion = get(cacheKey, length, region);
             final long regionStart = getRegionStart(region);
             fileRegion.populateAndRead(