Topic loading in rest-api should time out in zooKeeperOperationTimeoutSeconds (#4805)

(cherry picked from commit abe27e63)

pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java

@@ -1343,7 +1343,7 @@ public class PersistentTopicsBase extends AdminResource {
     private Topic getTopicReference(TopicName topicName) {
         try {
             return pulsar().getBrokerService().getTopicIfExists(topicName.toString())
-                    .get(pulsar().getConfiguration().getZooKeeperSessionTimeoutMillis(), TimeUnit.MILLISECONDS)
+                    .get(pulsar().getConfiguration().getZooKeeperOperationTimeoutSeconds(), TimeUnit.SECONDS)
                     .orElseThrow(() -> topicNotFoundReason(topicName));
         } catch (RestException e) {
             throw e;