Flip object ids for ID lookup

By flipping the object ids as keys their positions become the values of the array and it becomes easier to look them up. This way we don't need to do a separate time-consuming array_search call for each item.

src/Engines/AlgoliaEngine.php

@@ -183,13 +183,14 @@ public function map(Builder $builder, $results, $model)
         }
 
         $objectIds = collect($results['hits'])->pluck('objectID')->values()->all();
+        $objectIdPositions = array_flip($objectIds);
 
         return $model->getScoutModelsByIds(
                 $builder, $objectIds
             )->filter(function ($model) use ($objectIds) {
                 return in_array($model->getScoutKey(), $objectIds);
-            })->sortBy(function($model) use ($objectIds) {
-                return array_search($model->getScoutKey(), $objectIds);
+            })->sortBy(function($model) use ($objectIdPositions) {
+                return $objectIdPositions[$model->getScoutKey()];
             });
     }