add the ability to control the content type the map will serialize under

modules/elasticsearch/src/main/java/org/elasticsearch/action/index/IndexRequest.java

@@ -214,13 +214,22 @@ public class IndexRequest extends ShardReplicationOperationRequest {
     }
 
     /**
-     * Writes the JSON as a {@link Map}.
+     * Writes the Map as a JSON.
      *
      * @param source The map to index
      */
     @Required public IndexRequest source(Map source) throws ElasticSearchGenerationException {
+        return source(source, XContentType.JSON);
+    }
+
+    /**
+     * Writes the JSON as the provided content type.
+     *
+     * @param source The map to index
+     */
+    @Required public IndexRequest source(Map source, XContentType contentType) throws ElasticSearchGenerationException {
         try {
-            BinaryXContentBuilder builder = XContentFactory.contentBinaryBuilder(XContentType.JSON);
+            BinaryXContentBuilder builder = XContentFactory.contentBinaryBuilder(contentType);
             builder.map(source);
             this.source = builder.copiedBytes();
         } catch (IOException e) {

modules/elasticsearch/src/main/java/org/elasticsearch/util/xcontent/XContentType.java

@@ -20,11 +20,19 @@
 package org.elasticsearch.util.xcontent;
 
 /**
+ * The content type of {@link org.elasticsearch.util.xcontent.XContent}.
+ *
  * @author kimchy (shay.banon)
  */
 public enum XContentType {
 
+    /**
+     * A JSON based content type.
+     */
     JSON(0),
+    /**
+     * An optimized binary form of JSON.
+     */
     XSON(1);
 
     public static XContentType fromRestContentType(String contentType) {