Fix incorrect logging in stats API parameter parsing

Signed-off-by: Andy Qin <[email protected]>

Author: q-andy

src/main/java/org/opensearch/neuralsearch/rest/RestNeuralStatsAction.java

@@ -21,6 +21,7 @@
 import org.opensearch.rest.action.RestActions;
 import org.opensearch.transport.client.node.NodeClient;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.EnumSet;
 import java.util.List;
@@ -179,12 +180,13 @@ private NeuralStatsInput createNeuralStatsInputFromRequestParams(RestRequest req
 
     private boolean processRequestedStats(String[] stats, NeuralStatsInput neuralStatsInput) {
         boolean statAdded = false;
+        List<String> invalidStatNames = new ArrayList<>();
 
         for (String stat : stats) {
             // Validate parameter
             String normalizedStat = stat.toLowerCase(Locale.ROOT);
             if (isValidParamString(normalizedStat) == false) {
-                log.info("Invalid stat name parameter format: {}", normalizedStat);
+                invalidStatNames.add(normalizedStat);
                 continue;
             }
 
@@ -194,9 +196,14 @@ private boolean processRequestedStats(String[] stats, NeuralStatsInput neuralSta
             } else if (STATE_STAT_NAMES.contains(normalizedStat)) {
                 neuralStatsInput.getInfoStatNames().add(InfoStatName.from(normalizedStat));
                 statAdded = true;
+            } else {
+                invalidStatNames.add(normalizedStat);
             }
-            log.info("Non-existent stat name parsed: {}", normalizedStat);
         }
+        if (invalidStatNames.isEmpty() == false) {
+            log.info("Invalid stat names in neural stats request: {}", invalidStatNames);
+        }
+
         return statAdded;
     }