FIX: opensearch serverless parameter constraint (opensearch-project#5641)

Signed-off-by: George Chen <qchea@amazon.com>

Author: chenqi0805

data-prepper-plugins/opensearch/src/main/java/org/opensearch/dataprepper/plugins/sink/opensearch/configuration/ServerlessOptions.java

@@ -10,11 +10,11 @@
 
 public class ServerlessOptions {
 
-    @Size(min = 1, message = "network_policy_name cannot be empty")
+    @Size(min = 3, max = 32, message = "network_policy_name should have minimum length of 3 and maximum length of 32")
     @JsonProperty("network_policy_name")
     private String networkPolicyName;
 
-    @Size(min = 1, message = "collection_name cannot be empty")
+    @Size(min = 3, max = 32, message = "collection_name should have minimum length of 3 and maximum length of 32")
     @JsonProperty("collection_name")
     private String collectionName;