Added fix

src/main/groovy/com/rundeck/plugins/ansible/plugin/AnsibleResourceModelSource.java

@@ -57,6 +57,7 @@
 import java.util.Map.Entry;
 import java.util.Properties;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 import static com.rundeck.plugins.ansible.ansible.InventoryList.ALL;
 import static com.rundeck.plugins.ansible.ansible.InventoryList.CHILDREN;
@@ -815,18 +816,34 @@ public void applyNodeTags(NodeEntryImpl node, Map<String, Object> nodeValues) th
     InventoryList.tagHandle(NodeTag.DESCRIPTION, node, nodeValues);
   }
 
+  /**
+   * Adds a node to the ansibleNodes map, merging tags if the node already exists.
+   *
+   * @param node The node to add.
+   * @param tags The tags to associate with the node.
+   */
   public void addNode(NodeEntryImpl node, Set<String> tags) {
-    if (ansibleNodes.containsKey(node.getNodename())) {
-      NodeEntryImpl oldNode = ansibleNodes.get(node.getNodename());
-      Set<String> currentTags = getStringTags(oldNode);
-      currentTags.addAll(tags);
-      oldNode.setTags(Set.copyOf(currentTags));
-    } else {
-      node.setTags(Set.copyOf(tags));
-      ansibleNodes.put(node.getNodename(), node);
-    }
+    ansibleNodes.compute(node.getNodename(), (key, existingNode) -> {
+      if (existingNode != null) {
+        // Node exists, merge tags efficiently
+        Set<String> mergedTags = new HashSet<>(getStringTags(existingNode)); // Start with existing tags
+        mergedTags.addAll(tags); // Add the new tags
+        existingNode.setTags(Set.copyOf(mergedTags)); // Update the existing node
+        return existingNode; // Return the updated node
+      } else {
+        // Node doesn't exist, add it with the given tags
+        node.setTags(Set.copyOf(tags));
+        return node; // Return the new node
+      }
+    });
   }
 
+  /**
+   * Retrieves the tags from a node and converts them to strings.
+   *
+   * @param node The node whose tags are to be retrieved.
+   * @return A set of strings representing the node's tags.  Returns an empty set if the node has no tags.
+   */
   public Set<String> getStringTags(NodeEntryImpl node) {
     Set<String> tags = new HashSet<>();
     for (Object tag : node.getTags()) {