add description to shard changes action request (#80275) (#80333)

Author: idegtiarenko

x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/action/ShardChangesAction.java

@@ -169,6 +169,11 @@ public void writeTo(StreamOutput out) throws IOException {
             maxBatchSize.writeTo(out);
         }
 
+        @Override
+        public String getDescription() {
+            return "shardId[" + shardId + "]";
+        }
+
         @Override
         public boolean equals(final Object o) {
             if (this == o) return true;

x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/action/ShardChangesActionTests.java

@@ -267,4 +267,12 @@ public void onFailure(final Exception e) {
         assertThat(reference.get(), instanceOf(ShardNotFoundException.class));
     }
 
+    public void testShardChangesActionRequestHasDescription() {
+        var index = new Index("index", "uuid");
+        var shardId = new ShardId(index, 0);
+
+        var description = new ShardChangesAction.Request(shardId, "uuid").getDescription();
+
+        assertThat(description, equalTo("shardId[[index][0]]"));
+    }
 }