diff --git a/solr/solrj/src/java/org/apache/solr/common/cloud/ClusterState.java b/solr/solrj/src/java/org/apache/solr/common/cloud/ClusterState.java
index 22e1005ed8b..960729a3906 100644
--- a/solr/solrj/src/java/org/apache/solr/common/cloud/ClusterState.java
+++ b/solr/solrj/src/java/org/apache/solr/common/cloud/ClusterState.java
@@ -96,6 +96,7 @@ public ClusterState(Map<String, CollectionRef> collectionStates, Set<String> liv
    * @param collectionName the name of the modified (or deleted) collection
    * @param collection the collection object. A null value deletes the collection from the state
    * @return the updated cluster state which preserves the current live nodes
+   * @lucene.internal
    */
   public ClusterState copyWith(String collectionName, DocCollection collection) {
     LinkedHashMap<String, CollectionRef> collections = new LinkedHashMap<>(collectionStates);
@@ -223,6 +224,7 @@ public String getShardId(String collectionName, String nodeName, String coreName
     return null;
   }
 
+  @Deprecated
   public Map<String, List<Replica>> getReplicaNamesPerCollectionOnNode(final String nodeName) {
     Map<String, List<Replica>> replicaNamesPerCollectionOnNode = new HashMap<>();
     collectionStates.values().stream()
@@ -264,6 +266,7 @@ public String toString() {
    *     {@link ClusterState}
    * @return the ClusterState
    */
+  @Deprecated
   public static ClusterState createFromJson(
       int version,
       byte[] bytes,
@@ -284,6 +287,7 @@ public static ClusterState createFromJson(int version, byte[] bytes, Set<String>
     return createFromJson(version, bytes, liveNodes, Instant.EPOCH, null);
   }
 
+  @Deprecated
   public static ClusterState createFromCollectionMap(
       int version,
       Map<String, Object> stateMap,
@@ -313,6 +317,9 @@ public static ClusterState createFromCollectionMap(
     return createFromCollectionMap(version, stateMap, liveNodes, Instant.EPOCH, null);
   }
 
+  /**
+   * @lucene.internal
+   */
   // TODO move to static DocCollection.loadFromMap
   public static DocCollection collectionFromObjects(
       String name,
@@ -384,7 +391,9 @@ public boolean equals(Object obj) {
     } else return liveNodes.equals(other.liveNodes);
   }
 
-  /** Internal API used only by ZkStateReader */
+  /**
+   * @lucene.internal used only by ZkStateReader
+   */
   void setLiveNodes(Set<String> liveNodes) {
     this.liveNodes = Set.copyOf(liveNodes);
   }
@@ -473,6 +482,9 @@ public int size() {
   private static volatile Function<JSONParser, ObjectBuilder> STR_INTERNER_OBJ_BUILDER =
       STANDARDOBJBUILDER;
 
+  /**
+   * @lucene.internal
+   */
   public static void setStrInternerParser(Function<JSONParser, ObjectBuilder> fun) {
     if (fun == null) return;
     STR_INTERNER_OBJ_BUILDER = fun;
diff --git a/solr/solrj/src/java/org/apache/solr/common/cloud/DocCollection.java b/solr/solrj/src/java/org/apache/solr/common/cloud/DocCollection.java
index 1bb0cd42d41..cbfd5e7be92 100644
--- a/solr/solrj/src/java/org/apache/solr/common/cloud/DocCollection.java
+++ b/solr/solrj/src/java/org/apache/solr/common/cloud/DocCollection.java
@@ -232,6 +232,8 @@ public static String getCollectionPathRoot(String coll) {
    * that holds the same AtomicReference will see the same update
    *
    * <p>This does not create a new DocCollection.
+   *
+   * @lucene.internal
    */
   public final DocCollection setPerReplicaStates(PerReplicaStates newPerReplicaStates) {
     if (this.perReplicaStatesRef != null) {
@@ -260,11 +262,14 @@ private void addNodeNameReplica(Replica replica) {
     }
   }
 
+  /**
+   * @lucene.internal
+   */
   public static Object verifyProp(Map<String, Object> props, String propName) {
     return verifyProp(props, propName, null);
   }
 
-  public static Object verifyProp(Map<String, Object> props, String propName, Object def) {
+  private static Object verifyProp(Map<String, Object> props, String propName, Object def) {
     Object o = props.get(propName);
     if (o == null) {
       return def;
@@ -337,6 +342,7 @@ public Collection<Slice> getActiveSlices() {
   }
 
   /** Return array of active slices for this collection (performance optimization). */
+  @Deprecated
   public Slice[] getActiveSlicesArr() {
     return activeSlicesArr;
   }
@@ -357,6 +363,7 @@ public List<Replica> getReplicas(String nodeName) {
   }
 
   /** Get the list of all leaders hosted on the given node or <code>null</code> if none. */
+  @Deprecated
   public List<Replica> getLeaderReplicas(String nodeName) {
     return nodeNameLeaderReplicas.get(nodeName);
   }
@@ -469,6 +476,7 @@ public Iterator<Slice> iterator() {
     return slices.values().iterator();
   }
 
+  @Deprecated // low usage and builds an ArrayList (surprising)
   public List<Replica> getReplicas() {
     List<Replica> replicas = new ArrayList<>();
     for (Slice slice : this) {
@@ -481,6 +489,7 @@ public List<Replica> getReplicas() {
    * @param predicate test against shardName vs. replica
    * @return the first replica that matches the predicate
    */
+  @Deprecated // just one test; move it
   public Replica getReplica(BiPredicate<String, Replica> predicate) {
     final Replica[] result = new Replica[1];
     forEachReplica(
@@ -493,6 +502,7 @@ public Replica getReplica(BiPredicate<String, Replica> predicate) {
     return result[0];
   }
 
+  @Deprecated // just tests, so move out or make package-protected
   public List<Replica> getReplicas(EnumSet<Replica.Type> s) {
     List<Replica> replicas = new ArrayList<>();
     for (Slice slice : this) {
diff --git a/solr/solrj/src/java/org/apache/solr/common/cloud/Replica.java b/solr/solrj/src/java/org/apache/solr/common/cloud/Replica.java
index bd526c4fda2..d50dc1a1da8 100644
--- a/solr/solrj/src/java/org/apache/solr/common/cloud/Replica.java
+++ b/solr/solrj/src/java/org/apache/solr/common/cloud/Replica.java
@@ -329,6 +329,7 @@ public State getState() {
     return state;
   }
 
+  @Deprecated
   public void setState(State state) {
     this.state = state;
     propMap.put(ReplicaStateProps.STATE, this.state.toString());