Add thread pool names for object store operations. (#103491)

This commit adds names used by a plugin.

server/src/main/java/org/elasticsearch/repositories/blobstore/BlobStoreRepository.java

@@ -177,9 +177,9 @@ public abstract class BlobStoreRepository extends AbstractLifecycleComponent imp
 
     protected final ThreadPool threadPool;
 
-    public static final String STATELESS_SHARD_THREAD_NAME = "stateless_shard";
+    public static final String STATELESS_SHARD_READ_THREAD_NAME = "stateless_shard_read";
     public static final String STATELESS_TRANSLOG_THREAD_NAME = "stateless_translog";
-    public static final String STATELESS_UPLOAD_THREAD_NAME = "stateless_upload";
+    public static final String STATELESS_SHARD_WRITE_THREAD_NAME = "stateless_shard_write";
 
     public static final String SNAPSHOT_PREFIX = "snap-";
 
@@ -1984,9 +1984,9 @@ public abstract class BlobStoreRepository extends AbstractLifecycleComponent imp
             ThreadPool.Names.SNAPSHOT,
             ThreadPool.Names.SNAPSHOT_META,
             ThreadPool.Names.GENERIC,
-            STATELESS_SHARD_THREAD_NAME,
+            STATELESS_SHARD_READ_THREAD_NAME,
             STATELESS_TRANSLOG_THREAD_NAME,
-            STATELESS_UPLOAD_THREAD_NAME
+            STATELESS_SHARD_WRITE_THREAD_NAME
         );
     }