Add the ability to set percentiles and the execution hint to PercentileBuilder.

Author: jpountz

src/main/java/org/elasticsearch/search/aggregations/metrics/percentile/PercentileBuilder.java

@@ -1,13 +1,42 @@
 package org.elasticsearch.search.aggregations.metrics.percentile;
 
+import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.search.aggregations.metrics.ValuesSourceMetricsAggregationBuilder;
 
+import java.io.IOException;
+
 /**
  *
  */
 public class PercentileBuilder extends ValuesSourceMetricsAggregationBuilder<PercentileBuilder> {
 
+    private double[] percentiles;
+    private String executionHint;
+
     public PercentileBuilder(String name) {
         super(name, InternalPercentile.TYPE.name());
     }
+
+    public PercentileBuilder executionHint(String executionHint) {
+        this.executionHint = executionHint;
+        return this;
+    }
+
+    public PercentileBuilder percentiles(double... percentiles) {
+        this.percentiles = percentiles;
+        return this;
+    }
+
+    @Override
+    protected void internalXContent(XContentBuilder builder, Params params) throws IOException {
+        super.internalXContent(builder, params);
+
+        if (percentiles != null) {
+            builder.field("percentiles", percentiles);
+        }
+
+        if (executionHint != null) {
+            builder.field("execution_hint", executionHint);
+        }
+    }
 }