Changed the shard changes api to use get threadpool instead of management threadpool.

x-pack/plugin/src/main/java/org/elasticsearch/xpack/ccr/action/ShardChangesAction.java

@@ -200,7 +200,7 @@ public class ShardChangesAction extends Action<ShardChangesAction.Request, Shard
                                IndexNameExpressionResolver indexNameExpressionResolver,
                                IndicesService indicesService) {
             super(settings, NAME, threadPool, clusterService, transportService, actionFilters,
-                    indexNameExpressionResolver, Request::new, ThreadPool.Names.MANAGEMENT); // is management right tp?
+                    indexNameExpressionResolver, Request::new, ThreadPool.Names.GET);
             this.indicesService = indicesService;
         }