ES: fix write target forwarding

Add spec

ee/lib/elastic/latest/git_instance_proxy.rb

@@ -3,8 +3,12 @@
 module Elastic
   module Latest
     module GitInstanceProxy
-      def self.methods_for_all_write_targets
-        super + [:delete_index_for_commits_and_blobs]
+      extend ActiveSupport::Concern
+
+      class_methods do
+        def methods_for_all_write_targets
+          super + [:delete_index_for_commits_and_blobs]
+        end
       end
 
       def es_parent

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

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Elastic::Latest::GitInstanceProxy do
+  let(:project) { create(:project, :repository) }
+  let(:included_class) { Elastic::Latest::RepositoryInstanceProxy }
+
+  subject { included_class.new(project.repository) }
+
+  describe '.methods_for_all_write_targets' do
+    it 'contains extra method' do
+      expect(included_class.methods_for_all_write_targets).to contain_exactly(
+        *Elastic::Latest::ApplicationInstanceProxy.methods_for_all_write_targets,
+        :delete_index_for_commits_and_blobs
+      )
+    end
+  end
+
+  describe '#es_parent' do
+    it 'contains project id' do
+      expect(subject.es_parent).to eq("project_#{project.id}")
+    end
+  end
+
+  describe '#elastic_search' do
+    let(:params) do
+      {
+        type: :fake_type,
+        page: 2,
+        per: 30,
+        options: { foo: :bar }
+      }
+    end
+
+    it 'provides repository_id if not provided' do
+      expected_params = params.deep_dup
+      expected_params[:options][:repository_id] = project.id
+
+      expect(subject.class).to receive(:elastic_search).with('foo', expected_params)
+
+      subject.elastic_search('foo', params)
+    end
+
+    it 'uses provided repository_id' do
+      params[:options][:repository_id] = 42
+
+      expect(subject.class).to receive(:elastic_search).with('foo', params)
+
+      subject.elastic_search('foo', params)
+    end
+  end
+
+  describe '#delete_index_for_commits_and_blobs' do
+    let(:write_targets) { [double(:write_target_1), double(:write_target_2)] }
+    let(:read_target) { double(:read_target) }
+
+    before do
+      project.repository.__elasticsearch__.tap do |proxy|
+        allow(proxy).to receive(:elastic_writing_targets).and_return(write_targets)
+        allow(proxy).to receive(:elastic_reading_target).and_return(read_target)
+      end
+    end
+
+    it 'is forwarded to all write targets' do
+      expect(read_target).not_to receive(:delete_index_for_commits_and_blobs)
+      expect(write_targets).to all(
+        receive(:delete_index_for_commits_and_blobs).and_return({ '_shards' => {} })
+      )
+
+      project.repository.delete_index_for_commits_and_blobs
+    end
+  end
+end