PHPLIB-1563: set singleBatch option for findOne

Author: alcaeus

src/Operation/Find.php

@@ -424,6 +424,10 @@ private function createQueryOptions(): array
             $options['batchSize']++;
         }
 
+        if (isset($options['limit']) && $options['limit'] === 1) {
+            $options['singleBatch'] = true;
+        }
+
         return $options;
     }
 }