Add complexSearch from @xpress7

Author: timgws

src/ElasticquentTrait.php

@@ -269,6 +269,15 @@ public static function searchByQuery($query = null, $aggregations = null, $sourc
         return new ResultCollection($result, $instance = new static);
     }
 
+    public static function complexSearch($params)
+    {
+        $instance = new static;
+
+        $result = $instance->getElasticSearchClient()->search($params);
+
+        return new ResultCollection($result, $instance = new static);
+    }
+
     /**
      * Search
      *
@@ -581,4 +590,4 @@ public function newFromHitBuilder($hit = array())
 
         return $instance;
     }
-}
+}