dsmiley commented on code in PR #2846:
URL: https://github.com/apache/solr/pull/2846#discussion_r1830301431

##########
solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java:
##########
@@ -1094,20 +1094,19 @@ private SolrCore checkProps(ZkNodeProps zkProps) {
 
   private void getSlicesForCollections(
       ClusterState clusterState, Collection<Slice> slices, boolean 
activeSlices) {
+
     if (activeSlices) {
-      for (Map.Entry<String, DocCollection> entry : 
clusterState.getCollectionsMap().entrySet()) {
-        final Slice[] activeCollectionSlices = 
entry.getValue().getActiveSlicesArr();
-        if (activeCollectionSlices != null) {
-          Collections.addAll(slices, activeCollectionSlices);
-        }
-      }
+      clusterState
+          .collectionStream()
+          .map(DocCollection::getActiveSlicesArr)
+          .filter(Objects::nonNull)
+          .forEach(them -> Collections.addAll(slices, them));

Review Comment:
   `slices` would be logical but that's already in-scope; it's an "out" 
argument.  Despite the scope creep, I refactored further to eliminate the 
argument.  I think it's overall clearer.



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