DATAES-638 - Remove redundant public modifiers in @MultiField.

Original PR: spring-projects#303

Author: mars05

src/main/java/org/springframework/data/elasticsearch/annotations/MultiField.java

@@ -22,13 +22,14 @@
  * @author Mohsin Husen
  * @author Artur Konczak
  * @author Jonathan Yan
+ * @author Xiao Yu
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.FIELD)
 @Documented
 public @interface MultiField {
 
-	public Field mainField();
+	Field mainField();
 
-	public InnerField[] otherFields() default {};
+	InnerField[] otherFields() default {};
 }