Refactor the code

Author: saikatsarkar056

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/ibmwatsonx/IbmWatsonxServiceSettings.java

@@ -40,12 +40,18 @@
 import static org.elasticsearch.xpack.inference.services.ServiceUtils.removeAsType;
 import static org.elasticsearch.xpack.inference.services.ibmwatsonx.IbmWatsonxServiceFields.API_VERSION;
 import static org.elasticsearch.xpack.inference.services.ibmwatsonx.IbmWatsonxServiceFields.PROJECT_ID;
-import static org.elasticsearch.xpack.inference.services.ibmwatsonx.IbmWatsonxServiceSettings.DEFAULT_RATE_LIMIT_SETTINGS;
-import static org.elasticsearch.xpack.inference.services.ibmwatsonx.IbmWatsonxServiceSettings.MODEL_ID;
+import static org.elasticsearch.xpack.inference.services.ServiceFields.MODEL_ID;
 
 public class IbmWatsonxRerankServiceSettings extends FilteredXContentObject implements ServiceSettings, IbmWatsonxRateLimitServiceSettings {
     public static final String NAME = "ibm_watsonx_rerank_service_settings";
 
+    /**
+     * Rate limits are defined at
+     * <a href="https://www.ibm.com/docs/en/watsonx/saas?topic=learning-watson-machine-plans">Watson Machine Learning plans</a>.
+     * For Lite plan, you've 120 requests per minute.
+     */
+    private static final RateLimitSettings DEFAULT_RATE_LIMIT_SETTINGS = new RateLimitSettings(120);
+
     public static IbmWatsonxRerankServiceSettings fromMap(Map<String, Object> map, ConfigurationParseContext context) {
         ValidationException validationException = new ValidationException();