[API] Removes skipping index.get_alias/10_basic.yml

Closes #1469

Author: picandocodigo

elasticsearch-api/spec/skipped_tests_free.yml

@@ -18,11 +18,6 @@
   :file:        'cat.templates/10_basic.yml'
   :description: '*'
 
-# https://github.com/elastic/elasticsearch-ruby/issues/1469
--
-  :file:        'indices.get_alias/10_basic.yml'
-  :description: 'Get alias against closed indices'
-
 # https://github.com/elastic/elasticsearch-ruby/issues/1563
 -
   :file:        'tsdb/80_index_resize.yml'