Fix Flaky RemoteSplitIndexIT (opensearch-project#15107) (opensearch-project#18329)

Signed-off-by: Abhita Lakkabathini <abhital@amazon.com>

Author: abhita

server/src/internalClusterTest/java/org/opensearch/action/admin/indices/create/RemoteSplitIndexIT.java

@@ -118,7 +118,7 @@ public void cleanUp() throws Exception {
                 } catch (IOException e) {
                     fail();
                 }
-            }, 30, TimeUnit.SECONDS);
+            }, 60, TimeUnit.SECONDS);
         }
         super.teardown();
     }