refactor: introduce enum for node status

Author: bevzzz

src/main/java/io/weaviate/client6/v1/api/cluster/Node.java

@@ -6,9 +6,21 @@
 
 public record Node(
     @SerializedName("name") String name,
-    @SerializedName("status") String status,
+    @SerializedName("status") NodeStatus status,
+    /** Commit hash of the Weaviate build the node is running. */
     @SerializedName("gitHash") String gitHash,
+    /** Weaviate version the node is running. */
     @SerializedName("version") String version,
+    /**
+     * Can be {@code null} if "minimal" output is requested.
+     *
+     * @see NodeVerbosity#MINIMAL.
+     */
     @SerializedName("stats") CollectionStats stats,
+    /**
+     * Can be {@code null} if "minimal" output is requested.
+     *
+     * @see NodeVerbosity#MINIMAL.
+     */
     @SerializedName("shards") List<Shard> shards) {
 }

src/main/java/io/weaviate/client6/v1/api/cluster/NodeStatus.java

@@ -0,0 +1,18 @@
+package io.weaviate.client6.v1.api.cluster;
+
+import com.google.gson.annotations.SerializedName;
+
+public enum NodeStatus {
+  /** The node is functional and operating normally. */
+  @SerializedName("HEALTHY")
+  HEALTHY,
+  /** The node is down after encountering a problem. */
+  @SerializedName("UNHEALTHY")
+  UNHEALTHY,
+  /** The node is not available. */
+  @SerializedName("UNAVAILABLE")
+  UNAVAILABLE,
+  /** Liveness probe to a node timed out. */
+  @SerializedName("TIMEOUT")
+  TIMEOUT;
+};