[API] Removes knn_search

This API was only ever experimental and was deprecated, it isn't supported in 9.0, and only works
with `compatible-with=8` is set.

Author: picandocodigo

elasticsearch-api/lib/elasticsearch/api/actions/knn_search.rb

@@ -18,6 +18,6 @@
 module Elasticsearch
   module API
     VERSION = '9.0.0'.freeze
-    ES_SPECIFICATION_COMMIT = '4396e621134e40fe50a4b770c0487c1770763e43'.freeze
+    ES_SPECIFICATION_COMMIT = 'c02d8eb89a4efb3e719bd783715e2bf312479af8'.freeze
   end
 end

elasticsearch-api/lib/elasticsearch/api/version.rb

@@ -27,7 +27,7 @@
             spec.visibility != 'public' ||
             # TODO: Once the test suite is migrated to elasticsearch-specification, these should be removed
             spec.module_namespace.flatten.first == 'rollup' ||
-            ['scroll', 'clear_scroll', 'connector.last_sync'].include?(spec.endpoint_name)
+            ['scroll', 'clear_scroll', 'connector.last_sync', 'knn_search'].include?(spec.endpoint_name)
 
     # These are the path parts defined by the user in the method argument
     defined_path_parts = spec.path_params.inject({}) do |params, part|