anchor.diff:      <str name="dir">${solr.ulog.dir:}</str>
       <!--Any parameters from the original <updateLog> section -->
     </updateLog>
  +
  +  <!-- Other configuration options such as autoCommit should still be present -->
  +
   </updateHandler>
   ----
   
  
positive.code:     <str name="dir">${solr.ulog.dir:}</str>
      <!--Any parameters from the original <updateLog> section -->
    </updateLog>
  </updateHandler>
  ----
  
  
negative.code: 
  * Before starting, stop or pause the indexers. This is best done during a small maintenance window.
  * Stop the SolrCloud instances at the Source
  * Upload the modified `solrconfig.xml` to ZooKeeper on both Source and Target as appropriate, see the examples above.
  * Sync the index directories from the Source collection to Target collection across to the corresponding shard nodes. `rsync` works well for this.
  +
  For example, if there are 2 shards on collection1 with 2 replicas for each shard, copy the corresponding index directories from
  