Adding javadoc

Author: jonathan-buttner

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/external/http/sender/ChatCompletionInput.java

@@ -10,6 +10,13 @@
 import java.util.List;
 import java.util.Objects;
 
+/**
+ * This class encapsulates the input text passed by the request and indicates whether the response should be streamed.
+ * The main difference between this class and {@link UnifiedChatInput} is this should only be used for
+ * {@link org.elasticsearch.inference.TaskType#COMPLETION} originating through the
+ * {@link org.elasticsearch.inference.InferenceService#infer} code path. These are requests sent to the
+ * API without using the <code>_unified</code> route.
+ */
 public class ChatCompletionInput extends InferenceInputs {
     private final List<String> input;
 

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/external/http/sender/UnifiedChatInput.java

@@ -7,11 +7,21 @@
 
 package org.elasticsearch.xpack.inference.external.http.sender;
 
+import org.elasticsearch.action.ActionListener;
+import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.inference.Model;
 import org.elasticsearch.inference.UnifiedCompletionRequest;
 
 import java.util.List;
 import java.util.Objects;
 
+/**
+ * This class encapsulates the unified request.
+ * The main difference between this class and {@link ChatCompletionInput} is this should only be used for
+ * {@link org.elasticsearch.inference.TaskType#COMPLETION} originating through the
+ * {@link org.elasticsearch.inference.InferenceService#unifiedCompletionInfer(Model, UnifiedCompletionRequest, TimeValue, ActionListener)}
+ * code path. These are requests sent to the API with the <code>_unified</code> route.
+ */
 public class UnifiedChatInput extends InferenceInputs {
     private final UnifiedCompletionRequest request;