increase the wait timeout to fetch the master key

Signed-off-by: Jing Zhang <[email protected]>

ml-algorithms/src/main/java/org/opensearch/ml/engine/encryptor/EncryptorImpl.java

@@ -181,7 +181,10 @@ private void initMasterKey() {
         }));
 
         try {
-            latch.await(1, SECONDS);
+            boolean completed = latch.await(3, SECONDS);
+            if (!completed) {
+                throw new MLException("Fetching master key timed out.");
+            }
         } catch (InterruptedException e) {
             throw new IllegalStateException(e);
         }