Remove access to full parts and params

This could probably have been fully deleted, since it's only used in
test. This allows us to remove unnecessary and expensive data from the
spec files.

lib/elastomer_client/client/rest_api_spec/rest_api.rb

@@ -28,17 +28,17 @@ def body?
     class Url
       attr_reader :path
       attr_reader :paths
-      attr_reader :parts
-      attr_reader :params
+      attr_reader :parts_keys
+      attr_reader :params_keys
 
       def initialize(path:, paths: [], parts: {}, params: {})
         @path = path
         @paths = Array(paths)
-        @parts = parts
-        @params = params
+        @parts_keys = parts.keys
+        @params_keys = params.keys
 
-        @parts_set  = Set.new(@parts.keys)
-        @params_set = Set.new(@params.keys)
+        @parts_set  = Set.new(@parts_keys)
+        @params_set = Set.new(@params_keys)
       end
 
       def select_parts(from:)

test/client/rest_api_spec/rest_api_test.rb

@@ -88,11 +88,11 @@
     end
 
     it "accesses the path parts" do
-      assert_equal %w[index metric], @rest_api.url.parts.keys
+      assert_equal %w[index metric], @rest_api.url.parts_keys
     end
 
     it "accesses the request params" do
-      assert_equal %w[local master_timeout flat_settings ignore_unavailable allow_no_indices expand_wildcards], @rest_api.url.params.keys
+      assert_equal %w[local master_timeout flat_settings ignore_unavailable allow_no_indices expand_wildcards], @rest_api.url.params_keys
     end
   end
 end