Require search_scope for label filter

Also update specs

ee/lib/search/elastic/filters.rb

@@ -602,6 +602,8 @@ def filter_ids_by_feature(project_ids, user, feature)
         end
 
         def find_labels_by_name(names, options)
+          raise ArgumentError, 'search_scope is a required option' unless options.key?(:search_scope)
+
           return [] unless names.any?
 
           search_level = options[:search_scope].to_sym

ee/spec/lib/elastic/latest/issue_class_proxy_spec.rb

@@ -101,11 +101,11 @@
     describe 'named queries' do
       using RSpec::Parameterized::TableSyntax
 
-      where(:projects, :groups) do
-        [] | []
-        [ref(:project)] | []
-        [] | [ref(:group)]
-        [ref(:project)] | [ref(:group)]
+      where(:search_level, :projects, :groups) do
+        :global   | []              | []
+        :project  | [ref(:project)] | []
+        :group    | []              | [ref(:group)]
+        :project  | [ref(:project)] | [ref(:group)]
       end
 
       with_them do
@@ -116,6 +116,7 @@
         let(:base_options) do
           {
             current_user: user,
+            search_scope: search_level,
             project_ids: project_ids,
             group_ids: group_ids,
             public_and_internal_projects: false,

ee/spec/lib/search/elastic/filters_spec.rb

@@ -432,6 +432,14 @@
         end
       end
 
+      context 'when search_level is not provided' do
+        let(:options) { { label_name: label_name } }
+
+        it 'raises an exception' do
+          expect { by_label_ids }.to raise_exception(ArgumentError)
+        end
+      end
+
       context 'for global search' do
         let(:search_level) { :global }
 

ee/spec/lib/search/elastic/issue_query_builder_spec.rb

@@ -7,6 +7,7 @@
   let(:base_options) do
     {
       current_user: user,
+      search_scope: 'global',
       project_ids: project_ids,
       group_ids: [],
       public_and_internal_projects: false

ee/spec/lib/search/elastic/merge_request_query_builder_spec.rb

@@ -7,6 +7,7 @@
   let(:base_options) do
     {
       current_user: user,
+      search_scope: 'global',
       project_ids: project_ids,
       group_ids: [],
       public_and_internal_projects: true