address comments

Signed-off-by: Bhavana Ramaram <rbhavna@amazon.com>

plugin/src/main/java/org/opensearch/ml/processor/MLInferenceIngestProcessor.java

@@ -72,6 +72,7 @@ public class MLInferenceIngestProcessor extends AbstractProcessor implements Mod
     // At default, ml inference processor allows maximum 10 prediction tasks running in parallel
     // it can be overwritten using max_prediction_tasks when creating processor
     public static final int DEFAULT_MAX_PREDICTION_TASKS = 10;
+    public static final String DEFAULT_MODEl_INPUT = "{ \"parameters\": ${ml_inference.parameters} }";
     private final NamedXContentRegistry xContentRegistry;
 
     private Configuration suppressExceptionConfiguration = Configuration
@@ -494,12 +495,12 @@ public MLInferenceIngestProcessor create(
 
             // if model input is not provided for remote models, use default value
             if (functionName.equalsIgnoreCase("remote")) {
-                modelInput = (modelInput != null) ? modelInput : "{ \"parameters\": ${ml_inference.parameters} }";
+                modelInput = (modelInput != null) ? modelInput : DEFAULT_MODEl_INPUT;
             } else if (modelInput == null) {
                 // if model input is not provided for local models, throw exception since it is mandatory here
                 throw new IllegalArgumentException("Please provide model input when using a local model in ML Inference Processor");
             }
-            boolean defaultFullResponsePath = !functionName.equalsIgnoreCase("remote");
+            boolean defaultFullResponsePath = !functionName.equalsIgnoreCase(FunctionName.REMOTE.name());
             boolean fullResponsePath = ConfigurationUtils
                 .readBooleanProperty(TYPE, processorTag, config, FULL_RESPONSE_PATH, defaultFullResponsePath);