changed empty array to std class for particular queries

src/Aggregation/GlobalAggregation.php

@@ -41,6 +41,6 @@ class GlobalAggregation extends AbstractAggregation
      */
     public function getArray()
     {
-        return [];
+        return new \stdClass();
     }
 }

src/Aggregation/ReverseNestedAggregation.php

@@ -75,11 +75,11 @@ class ReverseNestedAggregation extends AbstractAggregation
             throw new \LogicException("Reverse Nested aggregation `{$this->getName()}` has no aggregations added");
         }
 
-        $data = [];
+        $output = new \stdClass();
         if ($this->getPath()) {
-            $data['path'] = $this->getPath();
+            $output['path'] = $this->getPath();
         }
 
-        return $data;
+        return $output;
     }
 }

src/Aggregation/TopHitsAggregation.php

@@ -138,6 +138,6 @@ class TopHitsAggregation extends AbstractAggregation
 
         $output = $this->processArray($output);
 
-        return $output;
+        return empty($output) ? new \stdClass() : $output;
     }
 }