Fix javadoc error.

See #2265

Author: sothawo

Diff for: src/main/java/org/springframework/data/elasticsearch/client/elc/ElasticsearchAggregations.java

@@ -63,8 +63,8 @@ public Map<String, ElasticsearchAggregation> aggregationsAsMap() {
 	/**
 	 * Returns the aggregation that is associated with the specified name.
 	 *
-	 * @param the name
-	 * @return the aggregation
+	 * @param name the name of the aggregation
+	 * @return the aggregation or {@literal null} if not found
 	 */
 	public ElasticsearchAggregation get(String name) {
 		return aggregationsAsMap.get(name);