Add support for setting the boost to a text query in the Java client

Author: hibnico

modules/elasticsearch/src/main/java/org/elasticsearch/index/query/xcontent/TextQueryBuilder.java

@@ -59,6 +59,8 @@ public static enum Type {
 
     private String analyzer;
 
+    private Float boost;
+
     private Integer slop;
 
     private String fuzziness;
@@ -100,6 +102,14 @@ public TextQueryBuilder analyzer(String analyzer) {
         return this;
     }
 
+    /**
+     * Set the boost to apply to the query.
+     */
+    public TextQueryBuilder boost(float boost) {
+        this.boost = boost;
+        return this;
+    }
+
     /**
      * Set the phrase slop if evaluated to a phrase query type.
      */
@@ -139,6 +149,9 @@ public TextQueryBuilder maxExpansions(int maxExpansions) {
         if (analyzer != null) {
             builder.field("analyzer", analyzer);
         }
+        if (boost != null) {
+            builder.field("boost", boost);
+        }
         if (slop != null) {
             builder.field("slop", slop);
         }