Expose the search-cluster node name on NodeInfo

The node stats adapter already fetches each node's name from the _nodes
response but dropped it: NodeInfo carried only version, OS, roles, and heap,
keyed by node id. The System Overview health panel's shard-count check needs
to join per-node shard counts (keyed by node name, from _cat/allocation) with
per-node heap (keyed by node id, from _nodes), and the only existing id-to-name
bridge is a per-node round-trip. Populate the node name in the OpenSearch 2/3
and Elasticsearch 7 adapters so a single _nodes read carries it.

Enables Graylog2/graylog-plugin-enterprise#14658.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: patrickmann

graylog-storage-elasticsearch7/src/main/java/org/graylog/storage/elasticsearch7/ClusterAdapterES7.java

@@ -284,6 +284,7 @@ public Map<String, NodeInfo> nodesInfo() {
 
     private NodeInfo createNodeInfo(JsonNode nodesJson) {
         return NodeInfo.builder()
+                .name(nodesJson.at("/name").asText())
                 .version(nodesJson.at("/version").asText())
                 .os(nodesJson.at("/os"))
                 .roles(toStream(nodesJson.at("/roles").elements()).map(JsonNode::asText).toList())

graylog-storage-opensearch2/src/main/java/org/graylog/storage/opensearch2/ClusterAdapterOS2.java

@@ -293,6 +293,7 @@ public Map<String, NodeInfo> nodesInfo() {
 
     private NodeInfo createNodeInfo(JsonNode nodesJson) {
         return NodeInfo.builder()
+                .name(nodesJson.at("/name").asText())
                 .version(nodesJson.at("/version").asText())
                 .os(nodesJson.at("/os"))
                 .roles(toStream(nodesJson.at("/roles").elements()).map(JsonNode::asText).toList())

graylog-storage-opensearch3/src/main/java/org/graylog/storage/opensearch3/ClusterAdapterOS.java

@@ -315,6 +315,7 @@ public Map<String, org.graylog2.system.stats.elasticsearch.NodeInfo> nodesInfo()
 
     private org.graylog2.system.stats.elasticsearch.NodeInfo createNodeInfo(JsonNode nodesJson) {
         return org.graylog2.system.stats.elasticsearch.NodeInfo.builder()
+                .name(nodesJson.at("/name").asText())
                 .version(nodesJson.at("/version").asText())
                 .os(nodesJson.at("/os"))
                 .roles(toStream(nodesJson.at("/roles").elements()).map(JsonNode::asText).toList())

graylog2-server/src/main/java/org/graylog2/system/stats/elasticsearch/NodeInfo.java

@@ -30,6 +30,9 @@ public static Builder builder() {
         return new AutoValue_NodeInfo.Builder();
     }
 
+    @JsonProperty
+    public abstract String name();
+
     @JsonProperty
     public abstract String version();
 
@@ -44,6 +47,8 @@ public static Builder builder() {
 
     @AutoValue.Builder
     public abstract static class Builder {
+        public abstract Builder name(String name);
+
         public abstract Builder version(String version);
 
         public abstract Builder os(Object os);